Who is XXX's sister?
Diana Mitford
Nancy Mitford (28 November 1904 -- 30 June 1973) Pamela Mitford (25 November 1907 -- 12 April 1994) Thomas Mitford (2 January 1909 -- 30 March 1945) Diana Mitford (17 June 1910 -- 11 August 2003) Unity Mitford (8 August 1914 -- 28 May 1948) Jessica Mitford (11 September 1917 -- 22 July 1996) Deborah Mitford (31 March 1920 -- 24 September 2014)
Unity Mitford