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) his married daughter, Elizabeth Britten who was to hold the property in trust until her children Walter and Emma Mary Harrington Britten reached the age of 21. At the time of William's death, Harrington Park comprised . Unusual for the district, its main livestock were 350 sheep and it also carried 40 cattle and 5 pigs. There was no dairy herd although dairying was emerging as the main farming activity in the Camden-Campbelltown area at this time. Major renovations were made to the house in the 1890s and a new drive was created which passed an ornamental pond and entered