Decker Nilsson Sixx grew up with one of rock music’s most famous surnames, but he chose a life far away from the stage. He is the son of Mötley Crüe bassist Nikki Sixx and former model Brandi Brandt, yet People’s profile of Nikki Sixx’s children shows that Decker followed a very different road. He graduated with honors from the University of Southern California, moved into real estate and construction work, and married his longtime partner Sommer in 2025. Instead of copying his father’s music career, Decker has quietly built an adult life around business, family, and work behind the scenes.
Quick Bio of Decker Nilsson Sixx
| Quick Bio | Details |
|---|---|
| Full Name | Decker Nilsson Sixx |
| Date of Birth | May 23, 1995 |
| Age in 2026 | 31 |
| Nationality | American |
| Famous For | Son of Nikki Sixx and Brandi Brandt |
| Father | Nikki Sixx |
| Mother | Brandi Brandt |
| Full Siblings | Gunner Nicholas Sixx, Storm Brieann Sixx |
| Half-Sisters | Frankie-Jean Mary Sixx, Ruby Feranna Sixx |
| Education | University of Southern California |
| Degree | Business Administration |
| Graduation | 2021, with honors |
| Career Field | Construction, estimating and real estate development |
| Earlier Job | Pre-Construction Manager at Sticks & Bricks Development |
| Current Public Job Listing | Estimator at Ryan Companies, San Diego |
| Wife | Sommer |
| Wedding | July 18, 2025 |
| Net Worth | Not publicly verified |
Decker’s family ties and education are well documented. His current professional profile also gives a clearer picture of his career than many older celebrity biographies. His personal finances and some parts of his private life remain unknown.
Who Is Decker Nilsson Sixx?
Decker Nilsson Sixx is the younger son of rock musician Nikki Sixx and his first wife, Brandi Brandt.
Nikki and Brandi had three children together: Gunner, Storm and Decker. People identifies Decker as their second son and youngest child together.
Unlike his father and older brother Gunner, Decker did not choose professional music.
He focused on school, business and real estate development instead.
That makes his story interesting.
He grew up inside a rock-and-roll family but decided success did not have to mean standing on a stage.
When Was Decker Nilsson Sixx Born?
Decker was born on May 23, 1995.
People confirms that date, as do biographical records connected with his father and sister.
IMDb’s family information even lists his birth time as 3:26 p.m., although that extra detail is less important than the well-supported date itself.
His exact birthplace is less firmly documented by major sources.
Many smaller biographies say Los Angeles, California, but People does not give a city in its detailed profile of Nikki’s children.
So May 23, 1995 is strongly supported.
An exact birthplace should be treated more carefully.
How Old Is Decker Nilsson Sixx in 2026?
Decker Nilsson Sixx is 31 years old as of August 2026.
He turned 31 on May 23, 2026. People’s updated May 2026 family profile also lists Decker as 31.
Some older articles still call him 27, 28, 29 or 30.
Those pages were simply written in earlier years and were not updated.
His birth date makes the math clear.
Who Is Decker Nilsson Sixx’s Father?
Decker’s father is Nikki Sixx, whose birth name is Frank Carlton Serafino Feranna Jr.
Nikki co-founded Mötley Crüe in 1981 and became the band’s bassist and main songwriter. His career also includes writing books, photography, radio and the band Sixx:A.M.
Mötley Crüe became one of the best-known hard-rock bands of the 1980s.
Albums such as Shout at the Devil, Girls, Girls, Girls and Dr. Feelgood helped make Nikki a major rock figure.
But Nikki has often spoken about fatherhood as being more important to him than his professional success.
People’s 2026 profile notes that he has called his children one of the greatest parts of his life.
Who Is Decker Nilsson Sixx’s Mother?
Decker’s mother is Brandi Brandt.
She became known as a model and was Playboy’s Playmate of the Month in October 1987. She also had some acting credits.
Brandi married Nikki Sixx in May 1989.
Their children followed over the next several years: Gunner in 1991, Storm in 1994 and Decker in 1995.
The marriage ended in 1996.
By then, Decker was still a baby.
How Old Was Decker When Nikki Sixx and Brandi Brandt Divorced?
He was only about six months old.
People directly notes that Decker was six months old when his parents divorced.
The dates make that especially clear.
Decker was born on May 23, 1995.
IMDb lists Nikki and Brandi’s divorce date as November 23, 1996 in one place, though People summarizes the separation simply as occurring in 1996. Some databases vary slightly on the precise legal timeline.
The important fact is that Decker was extremely young when the marriage ended.
His parents’ divorce was therefore part of his childhood rather than something that happened after he was already grown.
Why Is His Middle Name Nilsson?
Decker’s middle name has an interesting music connection.
A source devoted to singer-songwriter Harry Nilsson’s history cites a June 1995 Calgary Herald report saying Nikki named his newborn son Decker Nilsson and that Harry Nilsson had been an old friend of his.
The report also says Nikki said the name had come to him in a dream.
Harry Nilsson was a celebrated American singer-songwriter known for songs and recordings including “Everybody’s Talkin’” and “Without You.”
Nikki has also spoken elsewhere about knowing Nilsson personally.
So Decker’s middle name appears to carry a small piece of his father’s musical history.
Does Decker Nilsson Sixx Have Siblings?
Yes.
Decker is part of a large blended family.
His full siblings are Gunner Nicholas Sixx and Storm Brieann Sixx. All three were born during Nikki’s marriage to Brandi Brandt.
He also has two younger paternal half-sisters.
They are Frankie-Jean Mary Sixx, Nikki’s daughter with Donna D’Errico, and Ruby Feranna Sixx, Nikki’s daughter with Courtney Sixx.
That gives Nikki five children in total.
Who Is Gunner Sixx?
Gunner Nicholas Sixx is Decker’s older brother.
He was born on January 25, 1991.
Unlike Decker, Gunner did follow their father into music.
People reports that Gunner formed the band Figs Vision with childhood friend Jordan Spoliansky and has also released music under his own name.
Gunner is also a visual artist.
That makes the brothers a good example of two children from the same famous family choosing very different paths.
Gunner moved toward music and art.
Decker moved toward business and construction.
Who Is Storm Sixx?
Storm Brieann Sixx is Decker’s older sister.
She was born on April 14, 1994, a little more than a year before Decker.
Storm has remained more private than her father.
She is also an artist and launched a textile and home-goods project called Handsome Haus in 2022.
Nikki has publicly praised Storm’s academic work too.
People reports that he once proudly shared that she was in college and earning straight A grades.
Who Is Frankie-Jean Sixx?
Frankie-Jean Mary Sixx is Decker’s younger half-sister.
She was born on January 2, 2001, to Nikki Sixx and actress Donna D’Errico.
People reports that Frankie later studied psychology and sociology and created a crystal and alternative-wellness business.
Because Frankie has her own private family history and personal experiences, there is no need to turn those parts of her life into details about Decker.
The important connection is simply that they share Nikki as their father.
Who Is Ruby Sixx?
Ruby Feranna Sixx is Decker’s youngest half-sister.
She was born on July 27, 2019, to Nikki and Courtney Sixx.
There is a large age difference between Decker and Ruby.
Decker was already 24 when she was born.
Still, public posts show that he embraced his role as an older brother.
People notes that Decker shared a photograph holding newborn Ruby and publicly said he would always be there to protect her.
His own older Instagram content also includes birthday messages for Ruby.
Is Decker Nilsson Sixx Close to Nikki Sixx?
Public evidence suggests they have a warm father-son relationship.
One of the clearest examples came when Decker graduated from USC.
Nikki publicly celebrated him and praised how hard he had worked to get into the university and complete his studies.
Nikki called Decker both a great son and a great friend.
That is a meaningful detail because it came directly from his father rather than from a celebrity biography guessing about their relationship.
Decker has also shared positive posts about Nikki.
His public Father’s Day message described Nikki as not only a great musician but an even better dad.
Where Did Decker Nilsson Sixx Go to College?
Decker attended the University of Southern California, commonly called USC.
He graduated in 2021.
This became one of the most widely reported milestones in his adult life because Nikki proudly shared the graduation with fans.
Decker did not simply graduate.
People reports that he graduated with honors.
That gives readers a better idea of the direction he chose for himself.
He took academics seriously.
What Did Decker Sixx Study at USC?
Decker earned a degree in business administration.
That choice eventually connected naturally with his work in construction and real estate development.
It also separated him clearly from the family’s music tradition.
Nikki built songs.
Decker became interested in building projects in a much more literal way.
What Did Nikki Sixx Say About Decker’s USC Graduation?
Nikki was clearly proud.
In his graduation post, he praised Decker for working hard to get into USC and for treating difficult moments as lessons that could later help him in business.
The message also showed that Nikki viewed his son as more than a child who happened to carry a famous surname.
He was celebrating Decker’s own work.
People included the graduation story in its detailed profile of Nikki’s five children.
Did Decker Nilsson Sixx Become a Musician?
No professional music career is documented for Decker.
People specifically points out that, unlike Nikki and Gunner, Decker did not choose music as his professional path.
That does not mean he dislikes music.
He grew up inside a musical family.
It simply means his career went in another direction.
There is no established Decker Sixx band, major album, touring career or professional discography.
What Does Decker Nilsson Sixx Do for a Living?
Decker works in the construction and development world.
After college, People reported that he worked in real estate development at Sticks & Bricks Development in Scottsdale, Arizona.
He worked there as a pre-construction manager.
His responsibilities included construction budgets and coordination with utility companies.
However, there is a newer career update.
Decker’s current LinkedIn search profile now identifies him as an Estimator at Ryan Companies in San Diego.
That suggests his career has moved forward since the Sticks & Bricks information first became public.
Does Decker Sixx Still Work at Sticks & Bricks Development?
There is a small source conflict here.
People’s article, updated on May 26, 2026, still says Decker works at Sticks & Bricks Development as a pre-construction manager.
Older business-directory data also lists him with Sticks & Bricks.
But Decker’s current LinkedIn search listing identifies him as an Estimator at Ryan Companies in San Diego.
Let’s understand this simply.
People may be carrying an older career description even though the story itself was recently updated.
A current professional profile is usually a better clue to a job change.
So the newest available evidence suggests Decker has moved from Sticks & Bricks Development to Ryan Companies.
What Does an Estimator Do?
An estimator works out how much a construction project may cost.
That can involve studying plans, materials, labor, schedules and other project needs.
The job fits well with Decker’s earlier pre-construction work.
At Sticks & Bricks, he already worked with budgets and early project planning.
His current title at Ryan Companies suggests that he has continued building experience in the same broad industry rather than making a completely new career change.
How Did Decker Become Interested in Real Estate Development?
People reports that Decker’s interest grew after an internship connected with a luxury resort development in Turks and Caicos.
That experience showed him another side of business.
Instead of simply studying projects in a classroom, he could see how large developments came together in the real world.
He later moved into pre-construction work after graduating from USC.
This gives his career a clear story.
College gave him business knowledge.
The internship gave him real-world interest.
Construction and development became the next step.
Is Decker Sixx Married?
Yes.
This is an important update missing from many older biographies.
Decker’s current Instagram profile includes a post referring to Sommer as his wife.
His profile also includes a wedding-related post dated July 18, 2025.
Nikki later publicly celebrated “my son Decker and his beautiful new bride Sommer’s wedding” in September 2025.
So older websites calling Decker single or describing Sommer only as his girlfriend are now outdated.
Who Is Decker Sixx’s Wife?
Decker’s wife is named Sommer.
She appeared publicly in Decker and Nikki’s social posts before the marriage.
In November 2022, Nikki posted that his son Decker and his girlfriend Sommer had come to visit the family.
By 2023, Decker had posted a message referring to her as his “future Sommer Sixx.”
The couple later married in 2025.
Because Sommer is not a major public celebrity, there is no need to publish unnecessary information about her work, family, address or other private details.
When Did Decker Sixx Marry Sommer?
Decker’s own Instagram includes the date July 18, 2025, alongside a wedding-related post.
His later post calls Sommer his wife.
Nikki Sixx also publicly described Sommer as Decker’s new bride after the wedding.
Taken together, the evidence strongly supports July 18, 2025 as their wedding date.
This is one of the biggest changes needed in older Decker Nilsson Sixx biographies.
Articles written before 2025 may still describe him as unmarried.
How Long Were Decker and Sommer Together Before Marriage?
They were publicly together for at least several years.
Nikki referred to Sommer as Decker’s girlfriend in November 2022.
Decker later called her his future wife in a 2023 social post.
They married in July 2025.
Their exact first date has not been strongly documented, so it would be better not to invent a precise relationship anniversary before those public posts.
Does Decker Nilsson Sixx Have Children?
No reliable public source reviewed for this article confirms that Decker has children as of August 2026.
His social and family coverage focuses on his marriage, siblings, work and relationship with his father.
That does not prove he will never become a parent.
It only means there is no strong public confirmation to report right now.
Private family plans should remain private unless Decker or Sommer chooses to announce them.
Is Decker Sixx on Instagram?
Yes.
A public Instagram profile under @decker_sixx is indexed under his name.
The profile describes him as a USC alumnus and contains posts connected with Sommer, his family and different parts of his life.
Unlike Nikki, however, Decker has not built his career around public entertainment or celebrity social media.
His account gives fans occasional glimpses.
It is not the center of his professional identity.
Where Does Decker Sixx Live?
His exact home should remain private.
However, his current LinkedIn profile connects his work with San Diego, California, while his Instagram bio references both California and Arizona.
Earlier career reporting placed him at a Scottsdale, Arizona development company.
These details show that his professional life has included both states.
They do not justify publishing a private residential address.
What Is Decker Nilsson Sixx’s Net Worth?
Decker Nilsson Sixx’s personal net worth is not publicly verified.
Some celebrity websites may try to estimate his money because his father is wealthy.
That approach is not reliable.
Nikki Sixx’s finances are not automatically Decker’s finances.
Decker has his own education and professional career in construction and development.
Without real records showing salary, investments, property, debts and other assets, there is no honest way to give an exact figure.
Will Decker Inherit Nikki Sixx’s Money?
No reliable public information explains Nikki Sixx’s private estate plans for Decker or his other children.
Inheritance is not automatic in a way outsiders can calculate.
People may assume that the children of a successful musician will eventually receive a certain amount.
But wills, trusts, taxes and family decisions are private legal matters.
So any website claiming Decker has a specific future inheritance should be treated carefully.
Is Decker Nilsson Sixx Famous?
He is famous mainly because of his family.
People know the Sixx surname because of Mötley Crüe.
But Decker himself has not tried to become a professional celebrity.
He is not known for albums.
He is not a reality-TV regular.
He is not building an acting filmography.
Instead, People’s profile focuses on his USC education and real-estate career.
That gives him a public identity, but not a traditional entertainment career.
Did Decker Appear in The Dirt?
There is no established acting credit showing Decker playing a role in Netflix’s 2019 Mötley Crüe movie The Dirt.
He has attended family and music-related events because of his father.
That is different from being part of the film’s cast.
Some celebrity-family pages can blur this difference.
Being Nikki Sixx’s real son does not mean Decker played himself or another character in the movie.
Does Decker Want to Join Mötley Crüe?
There is no reliable evidence that he plans to become a Mötley Crüe musician.
His career choices point in the opposite direction.
People specifically notes that he chose business administration and real estate rather than music.
His current professional listing remains in the construction sector.
Of course, he can enjoy his father’s music without wanting the same job.
That appears to be exactly what has happened.
How Is Decker Different From Nikki Sixx?
The contrast is easy to see.
Nikki moved to Los Angeles as a teenager, played bass, formed bands and eventually became one of hard rock’s biggest names.
Decker went to USC.
He studied business.
He moved into construction and development work.
Yet there is also a connection between their paths.
Both seem interested in building things.
Nikki built bands, songs and creative projects.
Decker has built a career around actual development and construction projects.
Different worlds.
Similar drive.
What Has Nikki Sixx Said About Being Decker’s Father?
Nikki’s public comments suggest that his children are deeply important to him.
He has said that fatherhood gave him something he did not have growing up because his own father was absent.
With Decker specifically, his graduation tribute was full of pride.
Nikki praised his son’s hard work, attitude and plans for business.
That post also called Decker a friend.
For a father whose public image was once built around wild rock-and-roll behavior, these family moments show a very different side.
What Facts About Decker Nilsson Sixx Are Often Wrong Online?
The first mistake is his relationship status.
Older articles describe him as single or dating an unnamed girlfriend.
That information is outdated.
His own social profile now calls Sommer his wife, and family posts confirm their 2025 wedding.
Another outdated detail is his job.
People still describes him as working for Sticks & Bricks Development, while his current LinkedIn profile now lists Ryan Companies in San Diego.
Some websites also call Decker a musician.
No established professional music career supports that description.
Then there is his net worth.
No reliable exact figure exists.
Finally, some pages call Frankie and Ruby his “step-sisters.”
They are more accurately his paternal half-sisters, because all three share the same biological father, Nikki Sixx.
Why Do People Search for Decker Nilsson Sixx?
Nikki Sixx remains the biggest reason.
Mötley Crüe has attracted fans for decades, and many eventually become curious about the lives of the band members away from music.
Nikki’s children are especially interesting because they chose very different paths.
Gunner became a musician and artist.
Storm became an artist and entrepreneur.
Decker went into business and construction.
Frankie pursued education and wellness interests.
Ruby is still growing up.
Decker’s 2025 marriage has also created a newer reason for searches about him.
Older biography pages have not all caught up with his current life.
What Makes Decker Nilsson Sixx’s Story Interesting?
Decker could have used his surname to chase entertainment fame.
He had every possible connection.
His father helped build one of rock’s most recognizable bands.
His brother became a musician.
His family knew performers, artists and entertainment figures.
But Decker chose school.
He graduated from USC with honors.
He entered real estate development.
He then continued into construction estimating.
His personal life also moved forward quietly.
He built a long relationship with Sommer and married her in July 2025.
That is a different type of success story.
It is less loud than Mötley Crüe.
But perhaps that is exactly the point.
Final Thoughts
Decker Nilsson Sixx was born into rock royalty, but his adult life has followed a surprisingly normal and independent direction.
He was born on May 23, 1995, as Nikki Sixx and Brandi Brandt’s youngest child together. His older full siblings are Gunner and Storm.
His parents divorced while he was still a baby.
Nikki later had daughters Frankie-Jean with Donna D’Errico and Ruby with Courtney Sixx, giving Decker two younger half-sisters.
Decker did not follow Nikki and Gunner into music.
Instead, he studied business administration at the University of Southern California and graduated with honors in 2021. Nikki publicly celebrated the achievement and praised his son’s determination.
His early real-estate career included Sticks & Bricks Development in Scottsdale, where he worked as a pre-construction manager.
A newer professional update shows another step forward.
Decker’s current LinkedIn profile identifies him as an estimator at Ryan Companies in San Diego, suggesting that older Sticks & Bricks information is now out of date.
His personal life has changed too.
Nikki called Sommer Decker’s girlfriend in 2022. Decker later referred to her as his future wife, and the couple married on July 18, 2025. Decker now publicly calls Sommer his wife, while Nikki has celebrated his son and “beautiful new bride.”
Some information remains private.
There is no verified figure for Decker’s net worth.
There is no reliable current report confirming children.
His exact home is private.
Those blank spaces do not need made-up answers.
The confirmed facts already tell a clear story: Decker Nilsson Sixx grew up with a famous rock-star father, chose education instead of music, built a career in development and construction, married his longtime partner, and created an identity that is very much his own.
FAQs About Decker Nilsson Sixx
Who is Decker Nilsson Sixx?
Decker Nilsson Sixx is the son of Mötley Crüe bassist Nikki Sixx and former model Brandi Brandt. He is a USC graduate who works in construction and real-estate-related development.
When was Decker Nilsson Sixx born?
He was born on May 23, 1995.
How old is Decker Nilsson Sixx?
He is 31 years old as of August 2026.
Who are Decker Nilsson Sixx’s parents?
His parents are Nikki Sixx and Brandi Brandt.
Is Decker Nilsson Sixx Nikki Sixx’s biological son?
Yes. He is Nikki’s biological son with his first wife, Brandi Brandt.
Why is Decker’s middle name Nilsson?
A report tracing back to 1995 says Nikki chose Nilsson partly because singer-songwriter Harry Nilsson had been his friend.
Does Decker Sixx have siblings?
Yes. His full siblings are Gunner and Storm Sixx. His paternal half-sisters are Frankie-Jean and Ruby Sixx.
Is Gunner Sixx Decker’s brother?
Yes. Gunner Nicholas Sixx is his older full brother. Gunner became a musician and visual artist.
Is Storm Sixx Decker’s sister?
Yes. Storm Brieann Sixx is his older full sister.
Is Ruby Sixx Decker’s sister?
Yes. Ruby is his younger paternal half-sister through Nikki Sixx’s marriage to Courtney Sixx.
Where did Decker Nilsson Sixx go to college?
He attended the University of Southern California.
What did Decker Sixx study?
He earned a degree in business administration.
Did Decker graduate with honors?
Yes. He graduated from USC with honors in 2021.
Is Decker Nilsson Sixx a musician?
No established professional music career is documented. He chose a business and construction career instead.
What does Decker Sixx do for work?
His current LinkedIn profile identifies him as an estimator at Ryan Companies in San Diego. Earlier, he worked in real estate development and pre-construction at Sticks & Bricks Development.
Does Decker Sixx still work at Sticks & Bricks?
People still carries the older Sticks & Bricks role, but Decker’s current professional profile lists Ryan Companies. This suggests he has changed jobs.
Is Decker Nilsson Sixx married?
Yes. His own social profile now identifies Sommer as his wife.
Who is Decker Sixx’s wife?
His wife is Sommer. She had appeared publicly as his girlfriend before their marriage.
When did Decker Sixx get married?
His wedding-related Instagram post gives the date July 18, 2025. Nikki Sixx later publicly celebrated Decker and his new bride Sommer.
Does Decker Nilsson Sixx have children?
No reliable public source reviewed here confirms children as of August 2026.
Is Decker Sixx on Instagram?
Yes. His public account is indexed under the name Decker and identifies him as a USC alumnus.
What is Decker Nilsson Sixx’s net worth?
His exact personal net worth is not publicly verified. Online estimates should be treated as guesses rather than confirmed financial information.
Why is Decker Nilsson Sixx famous?
He is best known as Nikki Sixx’s son, but he has also gained attention for graduating from USC with honors, building a career in real estate and construction, and marrying Sommer in 2025.
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