Beckett), and David Charles Waterhouse (b. 1956). Through his third daughter Lady Rosemary, he was a grandfather of three: Alexander Pepys Muir (b. 1954) (a godson of Princess Margaret), Simon Huntly Muir (b. 1959), and Mary Arabella Muir (b. 1962). Through his youngest son, Lord Charles, he was a grandfather of three: Rupert John Harold Mark Spencer-Churchill (b. 1971), Dominic Albert Charles Spencer-Churchill (b. 1979), and Alexander David Spencer-Churchill (b. 1983). References External links John Albert William Spencer-Churchill, 10th Duke of Marlborough, thepeerage.com 1897 births 1972 deaths British Life Guards officers Burials at St Martin's Church, Bladon Deputy Lieutenants of Oxfordshire 110 English people of American descent English people of Dutch descent People educated at Eton College John Spencer-Churchill, 10th Duke John Spencer-Churchill, 10th Duke of Marlborough British Army personnel of World War I