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.
Charles Richard John Spencer-Churchill, 9th Duke of Marlborough, KG, TD, PC (13 November 1871 – 30 June 1934), styled Earl of Sunderland until 1883 and Marquess of Blandford between 1883 and 1892, was a British soldier and Conservative politician, and a close friend of his first cousin Winston Churchill.
Montagu and his wife, Lady Mary Churchill, were parents to five children:  Lady Isabella Montagu (d. 20 December 1786). Married first William Montagu, 2nd Duke of Manchester (no issue), and second Edward Hussey-Montagu, 1st Earl of Beaulieu (had issue). John (1706–1711) George (died in infancy) Lady Mary Montagu (c. 1711 ...
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.
Tenure: 13 June 2003 – present: Predecessor: Robin Russell, 14th Duke of Bedford: Other titles: Lord Howland (1962–2002) Marquess of Tavistock (2002–2003)
Elizabeth's maternal and paternal grandparents were, respectively, Sir John Montagu, 2nd Duke of Montagu and Lady Mary Churchill, and George Brudenell, 3rd Earl of Cardigan and Lady Elizabeth Bruce. Two of her maternal great-grandparents were John Churchill, 1st Duke of Marlborough and Lady Sarah Jenyns (later Churchill).