Mary Cavendish, Duchess of Devonshire Duchess of Devonshire (1895-1988) (1895–1988) Parents Cicely Gore James Gascoyne-Cecil, 4th Marquess of Salisbury Children Anne Tree William Cavendish, Marquess of Hartington Mary Cavendish Elizabeth Cavendish Andrew Cavendish, 11th Duke of Devonshire Siblings Beatrice Ormsby-Gore, Lady Harlech Robert Gascoyne-Cecil, 5th Marquess of Salisbury Lord David Cecil Partners Edward Cavendish, 10th Duke of Devonshire
