Clementina Pratt, Marchioness Camden British noble (1848–1886) (1848–1886) Parents Charlotte Spencer-Churchill, Duchess of Marlborough George Spencer-Churchill, 6th Duke of Marlborough Children John Pratt, Earl of Brecknock John Pratt, 4th Marquess Camden Lady Clementine Pratt Evelyn Green unnamed son Pratt Siblings Lord Almeric Spencer-Churchill Susan Harriett Elizabeth Churchill Lord Alan Spencer-Churchill Lord Alfred Spencer-Churchill John Spencer-Churchill, 7th Duke of Marlborough Lady Louisa Spencer-Churchill Lord Edward Spencer-Churchill Partners John Pratt, 3rd Marquess Camden Philip Green