The eldest son of the current New York City Police Commissioner Frank Reagan and his wife Mary, Danny grew up in Bay Ridge, Brooklyn with a younger sister, Erin, and two younger brothers, Joe and Jamie. He was happily married to Linda since 1996, with whom he has two sons, Jack (b. circa 2002) and Sean (b. circa 2004), until Linda's death off-screen between seasons 7 and 8. They lived on Staten Island until their home was destroyed in a fire in the season 7 finale, which was set by a drug cartel