Liam Costner is Kevin Costner’s fourth child and his only child with Bridget Rooney. Born in November 1996, he is 29 years old and turns 30 next month. Unlike several of his siblings, he has stayed out of the spotlight for most of his life. This guide covers his parents, stepfather, siblings, public appearances, and the rumors about his job, wealth, and relationships, separating documented facts from unverified claims.
Liam Costner Quick Facts
| Detail | Information |
| Full name | Liam Costner (some sites add “Timothy” as a middle name, unconfirmed) |
| Born | November 1996 (November 15 is widely reported) |
| Age | 29 (turns 30 in November 2026) |
| Nationality | American |
| Father | Kevin Costner |
| Mother | Bridget Rooney |
| Stepfather | Bill Koch |
| Siblings | Six paternal half-siblings |
| Occupation | Not confirmed by reliable sources |
| Marital status | Not publicly confirmed |
| Net worth | No verified figure |
Who Is Liam Costner?
Kevin Costner’s Fourth Child
PEOPLE lists Kevin Costner’s seven children as Annie, Lily, Joe, Liam, Cayden, Hayes, and Grace. Liam sits in the middle: three siblings are older, three are younger. The seven were born between 1984 and 2010.
The Only Child With Bridget Rooney
Liam is the only child Kevin shares with Bridget Rooney. The two had a brief relationship in the mid-1990s and never married. Kevin’s other six children were born to his marriages with Cindy Silva and Christine Baumgartner.
Liam Costner’s Age and Birthday
Born in November 1996
Liam was born two years after Kevin’s 1994 divorce from Cindy Silva, ending a marriage that lasted 16 years. A 1997 EL PAÍS report, citing PEOPLE, said a blood test confirmed Kevin as the father.
How Old Is Liam Costner in 2026?
As of October 2026, Liam is 29. He turns 30 in November 2026.
Is November 15 His Real Birthday?
Many biography sites list November 15, 1996. Major outlets such as PEOPLE confirm only the month and year, so treat the exact day as likely but not officially verified.
Liam Costner’s Parents
Kevin Costner: Oscar-Winning Actor and Director
Kevin was already a global star when Liam was born. Dances with Wolves won seven Academy Awards in 1991, including Best Picture and Best Director, and Field of Dreams, The Bodyguard, and Robin Hood: Prince of Thieves followed. Today he is also known for Yellowstone and Horizon: An American Saga.
Bridget Rooney: Liam Costner’s Mother
Bridget belongs to the Rooney family behind the Pittsburgh Steelers. PEOPLE describes her as the niece of Dan Rooney, the team’s longtime leader. She is also the granddaughter of founder Art Rooney Sr., so the two descriptions fit together.
How Kevin and Bridget’s Relationship Began and Ended
The relationship followed Kevin’s divorce and was short. Reports from the period say paternity was confirmed by testing, and PEOPLE reported in 2002 that Kevin set up a sizable trust for Liam and visited him “occasionally but not regularly.” Beyond that, little is documented about their private dealings.
Liam Costner’s Stepfather: Bill Koch
Who Is Bill Koch?
William “Bill” Koch is a billionaire businessman, art and wine collector, and sailor. He belongs to the well-known Koch family and won the America’s Cup in 1992. Bridget married him in 2005.
Life in the Koch Household
A 2013 5280 magazine profile of Koch described a large blended household and referred to Liam as Bridget’s son. That places Liam’s upbringing in a family network far from Hollywood.
The Rooney Family Connection
Art Rooney Sr. and the Pittsburgh Steelers
Art Rooney Sr. founded the Steelers in 1933, making the franchise more than 90 years old. Liam’s mother is his granddaughter.
Dan Rooney’s Place in the Family Tree
Dan Rooney, Art’s son, led the team for decades and died in 2017. He is Bridget’s uncle and Liam’s great-uncle.
Liam Costner’s Siblings
Where Liam Fits Among Kevin Costner’s Seven Children
Liam has six half-siblings on his father’s side. He is more than ten years older than the youngest three.
Annie, Lily and Joe (Children With Cindy Silva)
Annie worked as a child actor before moving into production. Lily has pursued music, and Joe works in sound.
Cayden, Hayes and Grace (Children With Christine Baumgartner)
Kevin married Christine on September 25, 2004. Their children are Cayden, Hayes, and Grace. Hayes appeared in Horizon: An American Saga.
Sibling Age Gap and Birth Years
| Child | Born | Mother | Known for |
| Annie | 1984 | Cindy Silva | Production work |
| Lily | 1986 | Cindy Silva | Music |
| Joe | 1988 | Cindy Silva | Sound work |
| Liam | 1996 | Bridget Rooney | Private life |
| Cayden | 2007 | Christine Baumgartner | Student/public family appearances |
| Hayes | 2009 | Christine Baumgartner | Acted in Horizon |
| Grace | 2010 | Christine Baumgartner | Public family appearances |
Liam Costner’s Childhood and Early Life
Growing Up Away From Hollywood
Liam grew up mostly outside the entertainment press, in a household connected to the Rooney and Koch families. Few reliable details of his childhood exist.
What Is Known About His Education
No trustworthy source publicly documents where Liam went to school. Sites that name schools or degrees do not cite verifiable records.
Why Liam Costner Is Rarely Seen in Public
Missing From the 2024 Cannes and Los Angeles Premieres
At the May 2024 Cannes premiere of Horizon: An American Saga, Kevin posed with five of his children. Liam was not among them, and he was also absent from the Los Angeles premiere that June.
Thanksgiving 2024 Family Photos
Kevin later shared a Thanksgiving photo with six of his children. News reports again noted that Liam was not pictured.
What the Absence Does and Doesn’t Mean
Not appearing in photos shows a low public profile, not a family conflict. Nobody outside the family can say why he skips public events.
What Does Liam Costner Do for a Living?
Occupation Claims Explained
Mainstream outlets do not report a confirmed occupation. PEOPLE’s profile says only that he generally stays out of the spotlight.
Does Liam Costner Work in Real Estate?
Several low-quality websites call him a real estate agent or professional. None offers licensing records or primary sources, so the claim is unverified.
Is He an Actor Like His Father?
No. He has no recognized acting credits, unlike Annie, Joe, and Hayes, who appeared in their father’s projects.
Liam Costner’s Net Worth
Why No Verified Figure Exists
No reliable outlet has published Liam’s income, assets, or finances. Exact net worth numbers online are guesses.
Family Wealth vs. Personal Wealth
Kevin’s earnings, the Rooney family’s Steelers ties, and Bill Koch’s billionaire status do not equal Liam’s personal wealth. The 2002 report of a trust fund shows Kevin made provisions for him, but not its size.
Is Liam Costner Married? Relationship Status
What Reliable Sources Say
No major outlet has reported a marriage or engagement. His dating life is not part of any credible public record.
Does He Have Children?
There are no verified reports that Liam has children.
Does Liam Costner Have Social Media?
Why Fan Accounts Shouldn’t Be Trusted
No authenticated Instagram, X, or Facebook account has been confirmed as his. Accounts using his name or photos are likely fan pages or impersonators, so avoid treating their posts as news.
Kevin Costner on Fatherhood
The “Anchor” Quote From 2024
In 2024 Kevin told PEOPLE that his children are the “anchor” of his life. The comment referred to all seven children as a group, not Liam specifically.
Parenting Seven Children
In a June 2025 PEOPLE interview, Kevin said raising seven children taught him to adapt to each personality. He also spoke about keeping the family together as they become busy adults.
Kevin Costner’s Charity Work (One805)
Kevin serves on the board of One805, a nonprofit supporting first responders in Santa Barbara County, created after the 2018 Montecito mudslides. It has held benefits at his California estate. No source links Liam to this work.
What Is Liam Costner Doing in 2026?
Latest Reports
PEOPLE’s 2026 family coverage still describes him as born in November 1996 and generally out of the spotlight. No new interviews, projects, or public announcements have appeared.
Turning 30 in November 2026
Liam turns 30 next month. Nothing confirms a planned public role, business launch, or media appearance.
Liam Costner vs. His Siblings: Different Paths
| Name | Career or public role | Public visibility |
| Annie | Production | Moderate |
| Lily | Music | Moderate |
| Joe | Sound | Low to moderate |
| Liam | Not confirmed | Very low |
| Hayes | Acted in Horizon | Moderate |
| Cayden and Grace | Family appearances | Moderate |
Common Myths About Liam Costner
“He’s Estranged From the Family”
Some tabloids use this word, but no reliable source confirms a current rift. The 2002 PEOPLE report described irregular visits, and Liam’s absence from photos proves nothing about relationships today.
“He Has a Hidden Acting Career”
No credits, agent listings, or filmography support this.
“He Inherited a Huge Fortune”
There is no verified inheritance. Only the 2002 trust fund report exists, and its value was never disclosed.
Conclusion: A Private Son in a Famous Family
Liam Costner’s family ties are well documented: Kevin Costner’s son, Bridget Rooney’s son, Bill Koch’s stepson, and a member of a seven-child family. His adult life is not. Until credible sources say more, the responsible portrait is of a private man who has chosen, or simply kept, a life away from publicity.
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Frequently Asked Questions About Liam Costner
Who is Liam Costner?
He is Kevin Costner’s fourth child and only child with Bridget Rooney.
How old is Liam Costner?
He is 29 and turns 30 in November 2026.
Who is Liam Costner’s mother?
Bridget Rooney, a member of the Rooney family tied to the Pittsburgh Steelers.
Who is Liam Costner’s stepfather?
Billionaire businessman Bill Koch, who married Bridget in 2005.
How many siblings does Liam Costner have?
Six paternal half-siblings: Annie, Lily, Joe, Cayden, Hayes, and Grace.
Is Liam Costner an actor?
No acting career is documented.
What does Liam Costner do for a living?
No reliable source confirms his job. Real estate claims are unverified.
Is Liam Costner married?
No marriage has been reliably reported.
What is Liam Costner’s net worth?
No verified figure exists.
Why is Liam Costner rarely seen with the family?
He keeps a low profile. He was absent from the 2024 Cannes premiere and Thanksgiving photos, but the reasons are not public.
Is Liam Costner related to the Pittsburgh Steelers’ Rooney family?
Yes, through his mother, who is Art Rooney Sr.’s granddaughter and Dan Rooney’s niece.
Does Liam Costner have an Instagram?
No verified account exists.
