Unity Mitford Diana was married to Oswald Mosley, leader of the British Union of Fascists. Unity Mitford was the fifth of seven children born in London, England to David Freeman-Mitford, 2nd Baron Redesdale, and his wife, Sydney (1880–1963), daughter of Thomas Gibson Bowles, MP. She was conceived in the town of Swastika, Ontario, in Canada, where her family had gold mines. Her siblings were Nancy (28 November 1904 – 30 June 1973), Pamela (25 November 1907 – 12 April 1994), Thomas (2 January 1909 – 30 March 1945), Diana (17 June 1910 – 11 August 2003), Jessica (11 September 1917 – 22
They Were Sisters from the immediate aftermath of World War I through to the late 1930s. The screenplay was developed by Pertwee from a popular novel of the same name by Dorothy Whipple, published in 1943. "They Were Sisters" features the spouses of both Mason and Calvert; Pamela Mason (billed under her maiden name Pamela Kellino, and playing Mason's daughter despite being only seven years younger) and Peter Murray-Hill. Mason later admitted that he acted most of his bullying, sadistic role with effectively an ongoing hangover as a means of dealing with the frustration he felt from his role and the British film