Liam Costner is the son of actor Kevin Costner and Bridget Rooney, a member of the family connected to the Pittsburgh Steelers. He was born in November 1996 and is one of Kevin Costner’s seven children.
Unlike his famous father and some of his siblings, Liam has stayed away from Hollywood. He is reported to work in real estate and keeps most of his personal life private.
Liam Costner’s Profile Summary
| Detail | Information |
|---|---|
| Full name | Liam Costner |
| Reported birthday | November 15, 1996 |
| Age | 29 years old as of October 2026 |
| Reported birthplace | Los Angeles, California, United States |
| Nationality | American |
| Father | Kevin Costner |
| Mother | Bridget Rooney |
| Stepfather | William “Bill” Koch |
| Profession | Reportedly a real estate agent |
| Reported workplace | Frankel Bell Group |
| Paternal half-siblings | Six |
| Maternal half-sibling | Kaitlin K.K. Koch |
| Relationship status | No publicly confirmed partner |
| Children | No publicly confirmed children |
| Net worth | Not reliably known |
Liam Costner’s Age and Early Life
Liam Costner was born in November 1996. PEOPLE confirms his birth month and year, while other reports give his full birthday as November 15, 1996.
Based on that date, Liam is 29 years old as of October 2026.
His reported birthplace is Los Angeles, California.
Liam spent much of his childhood outside the Hollywood spotlight. Unlike his father, he has not built a public career in movies or television.
Who Are Liam Costner’s Parents?
Liam’s parents are Kevin Costner and Bridget Rooney.
Kevin and Bridget had a relationship in the 1990s but never married. Liam is their only child together.
His parents separated, and Liam was mainly raised away from his father’s public Hollywood career.
Who Is Kevin Costner?
Kevin Costner is an American actor, director, producer, and musician.
He is known for movies and television projects such as Dances with Wolves, Robin Hood: Prince of Thieves, Tin Cup, The Postman, Yellowstone, and Horizon: An American Saga.
Kevin has received major honors during his career, including Academy Awards, Golden Globe Awards, and a Primetime Emmy Award.
He has seven children from three relationships. Liam is his fourth child.
Who Is Bridget Rooney?
Bridget Rooney is Liam’s mother.
She comes from the Rooney family, which is closely connected to the Pittsburgh Steelers. Bridget is the niece of Dan Rooney, the longtime owner of the NFL team.
She has also been connected with acting and is credited in the short film Zombie or Not Zombie.
Bridget later married businessman and investor William “Bill” Koch.
Liam Costner’s Paternity Test
Reports say there was a paternity test concerning Liam after his birth.
Sources disagree about who requested the test. Some say Kevin requested it, while another report says Bridget did.
The test reportedly confirmed Kevin Costner as Liam’s biological father.
Kevin later reportedly established a trust fund for Liam. The amount of that trust has not been publicly confirmed.
Liam’s Childhood With Bill Koch
Bridget Rooney later married billionaire businessman Bill Koch, who became Liam’s stepfather.
Bill Koch is known as a businessman, investor, collector, and yachtsman.
Liam therefore grew up with connections to several prominent families, including the Costner, Rooney, and Koch families.
Reports say Liam lived with his mother, stepfather, and members of the Koch family during his childhood.
Liam Costner’s Education
Reliable details about Liam’s education are limited.
His school, college, university, degree, and field of study have not been publicly confirmed.
Some reports say Liam played baseball and football during his school years.
There is no evidence that he pursued either sport professionally.
What Does Liam Costner Do?
Liam did not follow Kevin Costner into acting.
He is reported to work as a real estate agent.
A 2026 profile connects him with the Frankel Bell Group, a real estate team serving North Palm Beach County in Florida.
There is little reliable public information about when Liam entered real estate, his sales record, or his current position with the group.
Liam Costner’s Siblings
Liam has six half-siblings through his father.
They are:
- Annie Costner
- Lily Costner
- Joe Costner
- Cayden Wyatt Costner
- Hayes Logan Costner
- Grace Avery Costner
He also reportedly has a maternal half-sister named Kaitlin K.K. Koch, the daughter of Bridget Rooney and Bill Koch.
This means Liam has seven reported biological half-siblings in total.
Annie, Lily, and Joe Costner
Kevin had his first three children with his first wife, Cindy Silva.
Annie Costner was born on April 15, 1984. She acted as a child before moving into film production. She later co-founded Sound Off Films.
Lily Costner was born on August 4, 1986. She has worked as an actress and singer and has contributed music to some of her father’s projects.
Joe Costner was born on January 31, 1988. He appeared in films as a child and later worked as an audio engineer and production sound mixer.
All three are older than Liam.
Cayden, Hayes, and Grace Costner
Kevin later had three children with his former wife Christine Baumgartner.
Cayden Wyatt Costner was born on May 6, 2007.
Hayes Logan Costner was born on February 12, 2009. He appeared in Kevin’s Western project Horizon: An American Saga.
Grace Avery Costner was born on June 2, 2010.
All three are younger than Liam.
Kaitlin K.K. Koch
Liam also reportedly has a younger half-sister through his mother.
Kaitlin K.K. Koch is the daughter of Bridget Rooney and Bill Koch.
There is limited reliable public information about her personal life.
Liam Costner’s Relationship With Kevin Costner
Liam and Kevin reportedly had a complicated start because of the questions surrounding paternity.
However, Kevin has publicly recognized Liam as one of his seven children.
Kevin has spoken about the importance of all his children. In 2024, he described his children as the “anchor” of his life.
Liam appears in the media far less often than several of his siblings.
Why Liam Costner Stays Out of Hollywood
Liam has not developed a known career in acting, directing, or film production.
Several of his siblings have worked in acting, music, production, or sound. Liam instead reportedly chose real estate.
He is also rarely seen at major entertainment events involving his father.
For example, five of Kevin’s children attended the Los Angeles premiere of Horizon: An American Saga in June 2024, but Liam was not listed among them.
Is Liam Costner Married?
Liam has not publicly confirmed a wife or spouse.
Some secondary sources describe him as single, but his private life is not well documented.
There is also no publicly confirmed romantic partner as of 2026.
Does Liam Costner Have Children?
Liam does not have any publicly confirmed children.
He keeps his relationships and personal life largely outside the media.
Liam Costner’s Net Worth
Liam Costner’s personal net worth is not reliably known.
He reportedly earns money through his real estate career. Kevin is also reported to have established a trust for him after his paternity was confirmed.
However, the value of that trust is unknown.
Kevin Costner’s wealth and the wealth of Liam’s extended family should not be treated as Liam’s personal net worth.
Liam Costner on Social Media
There is no clearly verified public Instagram, Facebook, X, or TikTok account belonging to Liam in the available sources.
He has generally maintained a private public profile.
Where Is Liam Costner Now?
Liam is reported to be working in real estate.
Some reports connect his work with North Palm Beach County, Florida, while another source lists Los Angeles as his residence.
His exact current residence is therefore not clearly confirmed.
He continues to stay largely outside the entertainment industry and public spotlight.
Things to Know About Liam Costner
- Liam is Kevin Costner and Bridget Rooney’s only child together.
- He was born in November 1996.
- His reported birthday is November 15.
- He is Kevin Costner’s fourth child.
- His mother belongs to the Rooney family connected to the Pittsburgh Steelers.
- Kevin and Bridget never married.
- A paternity test reportedly confirmed Kevin as Liam’s father.
- Kevin reportedly established a trust fund for Liam.
- Bill Koch is Liam’s stepfather.
- Liam reportedly played baseball and football at school.
- He is reported to work in real estate.
- He has six paternal half-siblings.
- He also reportedly has a maternal half-sister, Kaitlin K.K. Koch.
- Liam has not built a public acting career.
- He has no publicly confirmed wife or partner.
- He has no publicly confirmed children.
- His personal net worth is not reliably known.
- He maintains a private life and is rarely seen at Hollywood events.
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