Today's marvelous Mitford is the only surviving sister, Debo, Dowager Duchess of Devonshire. Like her sisters, she wrote several books although hers wouldn't have made her mother very upset because they were basically about her home, Chatsworth and her garden. Debo's sisters claimed it was her ambition to marry a Duke but that story seems apocryphal because when she married her husband Andrew, he was a younger brother and not in line to inherit the dukedom. The older brother Billy, who was married to Kathleen Kennedy, sister of JFK, was killed in WW II and so Andrew fell into line for the dukedom. Debo is perhaps best know in fashion circles these days for being the grandmother of model Stella Tennant.