Deborah Cavendish, Duchess of Devonshire Deborah Cavendish, Duchess of Devonshire Deborah Vivien Cavendish, Duchess of Devonshire, (born Deborah Freeman-Mitford and latterly Deborah, Dowager Duchess of Devonshire; 31 March 1920 – 24 September 2014) was an English aristocrat, writer, memoirist and socialite. She was the youngest and last surviving of the six Mitford sisters, who were prominent members of English society in the 1930s and 1940s. Known to her family as "Debo", Deborah Mitford was born in Asthall Manor, Oxfordshire, England. Her parents were David Freeman-Mitford, 2nd Baron Redesdale (1878–1958), son of Algernon Freeman-Mitford, 1st Baron Redesdale, and his wife, Sydney (1880–1963), daughter of Thomas Gibson
Diana Mitford relationships with her sisters. Initially, Jessica and Deborah were not permitted to see Diana as she was "living in sin" with Mosley in London. Deborah eventually got to know Mosley and ended up liking him very much. Jessica despised Mosley's beliefs and became permanently estranged from Diana after the late 1930s. Pam and her husband Derek Jackson got along well with Mosley. Nancy never liked Mosley and, like Jessica, despised his political beliefs, but was able to learn to tolerate him for the sake of her relationship with Diana. Nancy wrote the novel "Wigs on the Green", which satirised Mosley