John Winston Spencer-Churchill, 7th Duke of Marlborough KG PC (2 June 1822 – 4 July 1883), styled Earl of Sunderland from 1822 to 1840 and Marquess of Blandford from 1840 to 1857, was a British Conservative cabinet minister, politician, peer, and nobleman.
John George Vanderbilt Henry Spencer-Churchill, 11th Duke of Marlborough, JP, DL (13 April 1926 – 16 October 2014) was a British peer. He was the elder son of the 10th Duke of Marlborough and his wife, the Hon. Alexandra Mary Hilda Cadogan.
Portrait of John Spencer-Churchill with his parents and younger brother, by John Singer Sargent, 1905. He was born in London on 18 September 1897 as the first of two sons born to Charles Spencer-Churchill, 9th Duke of Marlborough and his first wife, the former Consuelo Vanderbilt , an American railroad heiress. 
Duke of Marlborough (pronounced / ˈ m ɔːr l b r ə /) is a title in the Peerage of England.It was created by Queen Anne in 1702 for John Churchill, 1st Earl of Marlborough (1650–1722), the noted military leader.
María nació el 30 de abril de 1662 en el palacio de St. James en Londres, fue la hija mayor de Jacobo, duque de York —futuro Jacobo II de Inglaterra— y de su primera esposa, lady Ana Hyde.  Era sobrina de Carlos II y nieta de Edward Hyde, primer conde de Clarendon, quien durante mucho tiempo fue el consejero principal del rey.
The Marlboroughs' twelve-year-old son, Lord Churchill, was appointed Gloucester's Master of the Horse, and became a friend and playmate. Abigail Hill, a kinswoman of the Countess of Marlborough, was appointed his laundress, and Abigail's brother, Jack Hill, was made one of Gloucester's gentlemen of the bedchamber.
James FitzJames, 1st Duke of Berwick, 1st Duke of Liria and Jérica, 1st Duke of Fitz-James (21 August 1670 – 12 June 1734) was an Anglo-French military leader, illegitimate son of King James II of England by Arabella Churchill, sister of the 1st Duke of Marlborough.