O’Brien is married to Kristin Wurgler. The pair wedded in September 2006, within the sight of their dear loved ones however the accurate date and spot is as yet a riddle. Indeed, Austin and Kristin dated for quite a while before sharing marital promises. Besides, the two have a son named Declan Rhys, born on November 15, 2013.
O’Brien is also a sibling to Trever O’Brien who is an actor. Austin belongs to a family of actors and actresses, his brother appeared in films like A Private Matter, Homecoming, Lawnmower Man 2, &Nowhere Man. His sister Amanda O’Brien was featured in a short film The Oates’ Valor. The film was directed by Tim Thaddeus Cahill
