Kevin Costner has been married twice. His first marriage to Cindy Silva lasted from 1978 to 1994, during which they had three children: daughters Annie and Lily, and a son named Joe. His second marriage to Christine Baumgartner spanned from 2004 to 2023, and also brought three children into the world: two sons, Cayden Wyatt and Hayes Logan, and a daughter, Grace.

However, towards the end of his first marriage, Costner had an affair with a woman named Bridget Rooney, the niece of Dan Rooney, who was then the owner of the Pittsburgh Steelers. Their son, Liam, was born in 1996, although their relationship had started earlier. Exactly when they met is unclear, but it’s known they crossed paths during a round of golf while Costner was still married to Cindy. Reportedly, Kevin and Bridget’s relationship lasted for about three years.

A year after Costner remarried, Bridget also tied the knot, and not just with anyone—her husband became billionaire and business magnate William Koch, who assumed the role of stepfather to Liam. William and Bridget also share a daughter, Kaitlin, while Koch has four other children from previous marriages.

Liam, for the most part, avoids the public spotlight. The young man works as a luxury real estate agent and now goes by the name Liam Rooney Koch. Not much is known about his private life, but his net worth has been estimated online at no less than $800 million, with $40 million reportedly coming from his biological father, Kevin Costner.