Kevin Costner’s family is large, but the most mysterious member of it is his extramarital son Liam — someone even the actor’s fans rarely talk about. He was born in 1996 as the result of Costner’s relationship with Bridget Rooney, a member of the prominent family behind the NFL team the Pittsburgh Steelers. At first, the actor did not acknowledge the child, but a DNA test confirmed his paternity.
After her split from Costner, Bridget married billionaire William Koch, who became Liam’s stepfather. The couple later welcomed a daughter, Kaitlin, and Koch already had four children from previous marriages. During this time, Kevin moved on with his new wife, Christine Baumgartner, and raised three more children.
Liam grew up almost entirely outside the public eye. He stayed far from Hollywood — instead building a career in high-end real estate. He goes by the name Liam Rooney Koch and avoids public events and media attention altogether.
Still, his famous father’s name did influence his life. According to some reports, Liam’s fortune is estimated at around $800 million, with about $40 million coming from financial support provided by Kevin Costner. Yet Liam has long been living his own quiet life — and has no intention of returning to the public spotlight.
