Justin Trudeau three half-siblings, Kyle and Alicia, from his mother's remarriage to Fried Kemper, and Sarah, from his father's relationship with Deborah Coyne. Trudeau lived at 24 Sussex Drive, Ottawa, the official residence of Canada's prime minister, from his birth until his father's government was defeated in the federal election on May 22, 1979. The Trudeaus were expected to move into the residence of the Leader of the Official Opposition, Stornoway, at 541 Acacia Avenue in Rockcliffe Park, but because of flooding in the basement, prime minister Joe Clark offered them Harrington Lake, the prime minister's official country retreat in Gatineau Park,
Harrington Park (homestead) the estate comprised 800 acres of cleared land, pasture and forest with crop paddocks and a vegetable garden near the house. A second driveway approaches the homestead complex from within the new suburb of Harrington Park, off Parkway Drive / Cobbitty Road/ Oran Park Drive to its north via the new suburb and off the Northern Road to the west. A series of farm dams to the house's south-east have been modified or lost with residential development although the small pond alongside the 1890s realigned driveway remains within open space. Today the garden retains many mature coniferous and other trees