Kathleen married William John Robert Spencer-Cavendish, Marquess of Hartington on 6 May 1944. William (son of Edward William Spencer-Cavendish, 10th Duke of Devonshire and Lady Mary Alice Gascoyne-Cecil) was born on 10 Dec 1917 in 29 Arlington Street, London; died on 9 Sep 1944 in Belgium. [Group Sheet] [Family Chart]
1920 - 1948 (28 years)
