John Spencer-Churchill, Earl of Sunderland (1952-1955); eldest son of John Spencer-Churchill, 11th Duke of Marlborough, and Susan Hornby (1952–1955) Parents Susan Hornby John Spencer-Churchill, 11th Duke of Marlborough Children Siblings Lady Alexandra Spencer-Churchill Lord Edward Spencer-Churchill Lady Henrietta Spencer-Churchill Lord Richard Spencer-Churchill James Spencer-Churchill, 12th Duke of Marlborough Larissa Heber-Percy