In 1987, Quinn married his Stakeout co-star, Elizabeth Bracco (sister of Actress Lorraine Bracco). They have two daughters: Mia (b. 1998) and Ava Eileen (b. 1989) , who has autism. Ava appeared as the baby "David" in Avalon, and Mia played a ghost in The Eclipse. Former residents of Englewood, New Jersey, Quinn and his family now live in Palisades, Rockland County, New York and Marbletown in the Catskills / Woodstock region of Ulster County, New York.