Trudeau is predominantly of Scottish and French Canadian descent.
Justin Trudeau was born to Pierre Elliott Trudeau, then the 15th Prime Minister of Canada, and Margaret Trudeau (née Sinclair) on December 25, 1971, in Ottawa. He is the oldest of three sons born to his parents. His two younger brothers are Alexandre (Sacha) and Michel. His 5th great-maternal grandmother was the daughter of a French father and Malaccan mother, which makes Trudeau the first Canadian Prime Minister to have confirmed non-European lineage.
When Trudeau was six years old, his parents divorced, and his mother, Margaret (29 years younger than her husband, daughter of Liberal MP James Sinclair, and target of rumours that she had had romances with rock stars and other celebrities), moved out. As a result, Trudeau and his two younger brothers were raised by a single father who also led his country for 15 years (1968–79; 1980–84).