Deborah, the Dowager Duchess of Devonshire, and the last surviving Mitford sister, has died aged 94. Her son, the Duke of Devonshire, announced the death in a statement from Chatsworth House, her stately home. The Mitford sisters fascinated - and sometimes scandalised - British society in the 1940s. Unity was a friend of Hitler, Diana, the second wife of British fascist leader Sir Oswald Mosley, and Jessica a left-wing polemicist. Deborah was more focused on her home life.