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Aykroyd was born on Dominion Day (July 1), 1952 at The Ottawa Hospital in Ottawa, Ontario, Canada. He grew up in Ottawa, Canada's capital, where his father, Samuel Cuthbert Peter Hugh Aykroyd, a civil engineer, worked as a policy adviser to Canadian Prime Minister Pierre Trudeau. His mother, Lorraine Helene (nee Gougeon), was a secretary. His mother was of French Canadian descent and his father of English, Irish, Scottish, Dutch and French ancestry.

Aykroyd was briefly engaged to actress Carrie Fisher. He proposed to her on the set of The Blues Brothers (1980), in which she appeared as a spurned girlfriend of John Belushi's Jake Blues who was trying to kill both brothers. The engagement ended when she reconciled with her former boyfriend, musician Paul Simon. In 1983, he married actress Donna Dixon, with whom he starred in the movies Doctor Detroit (1983), on whose set they first met; Spies Like Us (1985); and The Couch Trip (1988). They have three daughters, Danielle, Stella and Belle.  Aykroyd maintains his Canadian roots as a longtime resident of Sydenham, Ontario, with his estate on Loughborough Lake.  In a 2004 NPR interview with host Terry Gross, Aykroyd said that he had been diagnosed in childhood with Tourette syndrome (TS) as well as Asperger syndrome (AS). He stated that his TS was successfully treated with therapy. In 2015, he stated during a HuffPost Show interview with hosts Roy Sekoff and Marc Lamont Hill that his AS was "never diagnosed" but was "sort of a self-diagnosis" based on several of his own characteristics.  Aykroyd is a former reserve commander for the police department in Harahan, Louisiana, working for Chief of Police Peter Dale. Aykroyd would carry his badge with him at all times. He currently serves as a Reserve Deputy of the Hinds County Sheriff's Department in Hinds County, Mississippi. He supports the Reserves with a fundraiser concert along with other Blues and Gospel singers in the State of Mississippi.
Dan Aykroyd