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In page Justin Trudeau:

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On June 23, 1971, the Prime Minister's Office (PMO) announced that Prime Minister Pierre Trudeau's wife of four months, the former Margaret Sinclair,[1] was pregnant and due in December.[2][3] Justin Trudeau was born on Christmas Day 1971 at 9:27 pm EST at the Ottawa Civic Hospital.[4] He is the second child in Canadian history to be born to a prime minister in office; the first was John A. Macdonald's daughter Margaret Mary Theodora Macdonald (February 8, 1869 – January 28, 1933). Trudeau's younger brothers Alexandre (Sacha) (born December 25, 1973) and Michel (October 2, 1975 – November 13, 1998) were the third and fourth.[5][6]