William Cavendish, 4th Duke of Devonshire former Prime Minister of the United Kingdom (1720–1764) Parents Catherine Cavendish, Duchess of Devonshire William Cavendish, 3rd Duke of Devonshire Children Lord Richard Cavendish George Cavendish, 1st Earl of Burlington William Cavendish, 5th Duke of Devonshire Dorothy Bentinck, Duchess of Portland Siblings Lord George Cavendish Lord John Cavendish Lady Rachel Cavendish Lord Frederick Cavendish Lady Elizabeth Cavendish Lady Caroline Cavendish Partners Charlotte Cavendish, Marchioness of Hartington
