Caroline Mulroney 12 years until 2005 when she returned to Canada, worked in financial services and became involved in charitable work. She also served on the board of directors of the Windsor–Detroit Bridge Authority. Mulroney is the only daughter and eldest child of the 18th Prime Minister of Canada, Brian Mulroney, and his wife Mila Mulroney. She is also a naturalized citizen of the United States. Mulroney is the eldest of four children and only daughter of former Prime Minister of Canada Brian Mulroney and his wife, Mila. One of her younger brothers is CTV morning host Ben Mulroney. Her father won
Brian Mulroney PCs, led provincially by Robert Stanfield, swept to a surprise victory. Mulroney became a youth delegate and attended the 1956 leadership convention in Ottawa. While initially undecided, Mulroney was captivated by John Diefenbaker's powerful oratory and easy approachability. Mulroney joined the "Youth for Diefenbaker" committee which was led by Ted Rogers, a future scion of Canadian business. Mulroney struck an early friendship with Diefenbaker (who won the leadership) and received telephone calls from him. Mulroney won several public speaking contests at St. Francis Xavier University, was a star member of the school's debating team, and never lost an interuniversity debate.