Mulroney, the middle child of five siblings, is of Irish and German origin.
Mulroney starred in the 1988 baseball movie Long Gone, for which he received a CableACE Award nomination for Best Supporting Actor in a Miniseries or Movie.
During his 1989 role in Survival Quest, he got to know Catherine Keener. When Mulroney dove into the river during filming in 1986[3], Keener swam perilously close to whitewater rapids before being rescued half a mile downstream.
In the end, the couple was hitched in 1990. The duo would later make appearances in four other movies: Lovely & Amazing (2001), Heroine of Hell (1996), Box of Moonlight (1996), and Living in Oblivion (1995).
Dermot Mulroney Siblings: Meet Kieran Mulroney, Sean Mulroney, Moira Mulroney, Conor Mulroney
He has a younger brother named Kieran Mulroney who works as an actor and playwright, two elder brothers named Conor and Sean, and a younger sister named Moira. Not much is known about their personal lives.