Her father, a British Royal Air Force pilot, was killed in the Second World War in 1943. Tremaine, who were married in Chelsea, London in 1940. Pettet was born in Westminster, London, England, daughter of Harold Nigel Egerton Salmon and Cecily J. Joanna Pettet (born Joanna Jane Salmon 16 November 1942) is a British-born Canadian retired actress.
