Much of Thistle's historical research is based on the stories and experience of his family and ancestors. His mother, Blanche Morissette, is Métis-Cree and was a member of the Park Valley road allowance community in Big River, Saskatchewan. His father, Cyril "Sonny" Thistle, is of Scot-Algonquin ancestry and has been missing since 1982. Thistle's maternal great grandmother, Marianne Ledoux Morissette, was present and supported the Métis Resistance in 1885 during the Battle of Batoche. The documentary "Family Camera" directed by Marc de Guerre for TVOntario includes images of the Morissette family and interviews with Thistle, his mother and aunts where they recount the history and experience of living in the road allowance community and the legacy of the Canadian government's treatment of the Métis people.