Liam Costner: The Kevin Costner Son Who Never Went Public
Published on: October 18, 2026
Written By
Faye Smith
Reviewed By
Richard Dennis
Two of America’s more famous surnames meet in one man, and he has spent nearly thirty years making sure nobody notices. The Hollywood name came from his father. The other one owns a football team.
Liam Costner is 29 years old, born in November 1996 to Kevin Costner and Bridget Rooney. He has no acting credits, no public career and no Wikipedia page, and he turns 30 next month.
Who Is Liam Costner?
He is the fourth of Kevin Costner’s seven children and the only one from the actor’s relationship with Bridget Rooney. That relationship was brief and fell between Costner’s two marriages.
What makes him unusual among famous children is not the privacy itself but how completely it has held. There is no social media presence trading on the name, no attempt at a screen career, and no interviews.
Liam Costner: Quick Facts
| Age | 29, turning 30 in November 2026 |
|---|---|
| Born | November 1996 |
| Father | Kevin Costner |
| Mother | Bridget Rooney |
| Mother’s family | Granddaughter of Art Rooney, founder of the Pittsburgh Steelers |
| Stepfather | Bill Koch, married his mother in 2005 |
| Half-sister | Kaitlin Koch |
| Costner half-siblings | Annie, Lily, Joe, Cayden, Hayes and Grace |
| Acting credits | None |
| Wikipedia page | None |
| Marital status | Not publicly documented |
| Net worth | No credible figure published |
| Public profile | Has never sought one |
His Mother, Bridget Rooney
His mother brings a second dynasty into the story, and it is the half most coverage skips over. Bridget Rooney is a granddaughter of Art Rooney, the man who founded the Pittsburgh Steelers in 1933, and a niece of Dan Rooney, who ran the franchise for decades.
That makes him a descendant of one of the most established families in American professional sport. The Rooneys have owned the Steelers across four generations, which is a longer institutional run than almost anything in Hollywood.
Two inheritances, then, and he has traded on neither. The football side of his lineage is arguably the more remarkable one, and it is the side almost nothing written about him mentions.
The Billionaire Stepfather
In 2005, when he was eight, his mother married Bill Koch. That is the household he grew up in from then on.
Koch is not a minor figure. He founded the Oxbow Group, an energy holding company based in West Palm Beach, his fortune was put at $1.8 billion in 2019, and in 1992 he won the America’s Cup with the yacht America³, a campaign he reportedly spent around $65 million on.
Bridget Rooney and Koch have a daughter, Kaitlin, which gives him a half-sister on his mother’s side in addition to the six on his father’s. Between the two households he has seven siblings and half-siblings in total.
Is Liam Costner an Actor?
No. He has no acting credits, no filmography and no television appearances, which is the direct answer to the question most often asked about him.
His father has addressed the general point. Kevin Costner has said he has not pushed his children into acting, and the one child who has appeared on screen did so in a small part rather than a launched career.
The searches asking for his movies and television shows are looking for something that does not exist. A famous surname is not a résumé, and in his case it has never been used as one.
Was Liam Costner in Yellowstone?
No, and neither was any other Costner child. The confusion is straightforward, because Kevin Costner played John Dutton in Yellowstone for five seasons and the association transfers to the family name.
The one son who has acted is Hayes Costner, and it was not Yellowstone. Hayes played Nathaniel Kittredge in Horizon: An American Saga, his father’s own film, at 15.
Kevin Costner was candid about how that came about. He said the role needed about two weeks of filming, called it a smaller part, and admitted he “selfishly” wanted his son with him on set.
Liam Costner and Liam Hemsworth
There is no connection between them. They share a first name, they are not related, and neither has commented on the other.
The pairing turns up in search because the two names sit close together alphabetically and both belong to men in their twenties and thirties attached to famous families. That is the whole of it.
Kevin Costner’s Seven Children
The family is large and spread across three relationships, which is why the sibling question gets asked as often as it does. Laid out with birth dates, the structure is clear.
Kevin Costner’s Seven Children
| Name | Born | Age | Mother |
|---|---|---|---|
| Annie Costner | April 15, 1984 | 42 | Cindy Silva |
| Lily Costner | August 4, 1986 | 40 | Cindy Silva |
| Joe Costner | January 31, 1988 | 38 | Cindy Silva |
| Liam Costner | November 1996 | 29 | Bridget Rooney |
| Cayden Wyatt Costner | May 6, 2007 | 19 | Christine Baumgartner |
| Hayes Logan Costner | February 12, 2009 | 17 | Christine Baumgartner |
| Grace Avery Costner | June 2, 2010 | 16 | Christine Baumgartner |
Where He Fits in the Family
He sits in a gap. Eight years separate him from Joe, the youngest of the first three, and eleven years separate him from Cayden, the eldest of the last three.
That positioning explains more than any personality sketch could. He was too young to share a childhood with the first group and too old to share one with the second, and he was living in a different household from all six of them.
The first three children grew up with Kevin Costner and Cindy Silva in Los Angeles. The last three grew up with Costner and Christine Baumgartner. He grew up with his mother and Bill Koch, which is a materially different upbringing from either.
Is Liam Costner Married?
Nothing has been publicly documented. No wife, partner or children have been named in any record that can be checked, and he has made no announcements.
That is consistent with everything else about him rather than a gap in the reporting. A man who has given no interviews in twenty-nine years has not been publishing relationship news either.
Does Liam Costner Have a Wikipedia Page?
No. His father’s encyclopedia entry records a son born in 1996 to Bridget Rooney without naming him, which is the extent of his presence there.
Wikipedia requires substantial independent coverage of a person in their own right. Being somebody’s child does not meet that threshold, and he has done nothing else that would.
His Net Worth
No credible figure exists. The amounts published under his name are not derived from anything, since he has no public income, no company and no disclosed assets.
What can be said is contextual. He grew up between a father with a long film career and a stepfather valued in the billions, and what either of those means for him personally has never been made public.
What Can Be Confirmed
Six things here are solid. He was born in November 1996, his parents are Kevin Costner and Bridget Rooney, his mother is a granddaughter of Steelers founder Art Rooney, his stepfather is Bill Koch, he has six Costner half-siblings and one Koch half-sister, and he has no acting credits.
Four are not. No marriage or partner has been documented, no profession has been confirmed, no net worth figure has any basis, and no exact date of birth beyond the month has been published. Celebrity children attract invented detail in direct proportion to how little they say, a pattern that also runs through the profile of Jadarius Jenkins.
Frequently Asked Questions
These cover the questions asked alongside his name. Where nothing has been documented, that is stated rather than filled in with a guess.
Who is Liam Costner?
He is the fourth of Kevin Costner’s seven children, born in November 1996 to the actor and Bridget Rooney. He is 29 and has never had a public career.
Who is Liam Costner’s mother?
Bridget Rooney, a granddaughter of Art Rooney, who founded the Pittsburgh Steelers in 1933. She married the billionaire Bill Koch in 2005.
How old is Liam Costner?
He is 29. He was born in November 1996, so he turns 30 in November 2026. The exact day has not been published.
Is Liam Costner an actor?
No. He has no acting credits, no filmography and no television appearances. Kevin Costner has said he has not pushed his children into acting.
What movies and TV shows has Liam Costner been in?
None. Searches for his filmography are looking for something that does not exist, since he has never worked on screen.
Was Liam Costner in Yellowstone?
No. His father played John Dutton across five seasons, but no Costner child appeared in the series. The only son who has acted is Hayes, in Horizon: An American Saga.
Is Liam Costner related to Liam Hemsworth?
No. They share a first name and nothing else. They are not related and neither has any documented connection to the other.
Who is Liam Costner’s stepfather?
Bill Koch, who married Bridget Rooney in 2005. He founded the Oxbow Group, had his fortune put at $1.8 billion in 2019, and won the 1992 America’s Cup.
How many siblings does Liam Costner have?
Six half-siblings through his father and one through his mother. The Costner children are Annie, Lily, Joe, Cayden, Hayes and Grace, and his Koch half-sister is Kaitlin.
Is Liam Costner married?
Nothing has been publicly documented. No wife, partner or children have been named in any checkable record.
Does Liam Costner have a Wikipedia page?
No. His father’s entry mentions a son born in 1996 without naming him, and that is his only presence there.
What does Liam Costner do for a living?
No profession has been confirmed. Claims about his career circulate without sourcing, and he has never discussed his work publicly.
