Mulroney was born in Alexandria, Virginia

Alexandria, Virginia

Alexandria is an independent city in the Commonwealth of Virginia. As of 2009, the city had a total population of 139,966. Located along the Western bank of the Potomac River, Alexandria is approximately six miles south of downtown Washington, D.C.Like the rest of northern Virginia, as well as...

, the son of Ellen, a housewife and amateur actress originally from Manchester, Iowa

Manchester, Iowa

Manchester is a city in Delaware County, Iowa, United States. The population was 5,257 at the 2000 census. As of the 2005 population estimates, Manchester's population was 5,052...

, and Michael Mulroney, a law professor (and amateur racecar driver) at Villanova University

Villanova University

Villanova University is a private university located in Radnor Township, a suburb northwest of Philadelphia, Pennsylvania, in the United States...

 School of Law, originally from Elkader, Iowa

Elkader, Iowa

Elkader is a city in Clayton County, Iowa, United States. The population was 1,465 at the 2000 census. It is the county seat of Clayton County.-History:The city is named after Algerian leader Abd al-Qadir al-Jaza'iri...

. He has a sister, Moira, and three brothers, Conor, Kieran

Kieran Mulroney

Kieran Mulroney is an American actor known for his numerous television appearances. He is also a musician and screenwriter, along with his wife, Michele. He was born in Alexandria, Virginia, where he graduated from T. C. Williams High School. His brother is actor Dermot Mulroney.-Television:* NCIS...

 (who is also an actor), and Sean. Moira formerly worked in the Philadelphia DA's office as an assistant district attorney and is currently employed by WXPN, an FM radio station in Philadelphia.