What American Socialite married the elder son of Edward Cavendish?
William Cavendish, Marquess of Hartington Major William John Robert "Billy" Cavendish, Marquess of Hartington (10 December 1917 – 9 September 1944) was an English politician and soldier. He was the elder son of Edward Cavendish, 10th Duke of Devonshire, and his wife, Lady Mary Gascoyne-Cecil. He was the husband of Kathleen Kennedy, sister of the future U.S. President John F. Kennedy.
Sir Edward Burgh Sir Edward Burgh (pronounced as Borough) (d. before April 1533) was the eldest son and heir to Sir Thomas Burgh, 1st Baron Burgh and his wife Agnes Tyrwhit. He is known for being the first husband of Catherine Parr, later Queen consort to King Henry VIII. 18th-century historians have mistaken him for his grandfather, the elderly, Sir Edward Burgh, 2nd Baron Burgh of Gainsborough.