in 1876 His surname was
Spencer until 1817, when his father changed his and his children's surname to
Spencer-Churchill (by royal licence dated 26 May 1817). As a young man, he went through a false ceremony of marriage to Susannah Law, with his brother Lord Charles posing as a cleric. They lived as a married couple under the name Captain and Mrs Lawson and had a baby girl, named Susanna. Upon discovery of the deception a voyage to Scotland, was intended by the bride and her parents to make this marriage legal under Scottish law. The sixth Duke did, however, successfully contest in a court of law that they had lived as if they had been married. Child by Harriet Caroline Octavia Spencer, who subsequently married her cousin, Count Karl Theodor von Westerholt (1795–1863), son of Count
Alexander von Westerholt, in 1819: • Susan Harriett Elizabeth Churchill (1818–1887), married Aimé Timothée Cuénod (1808–1882). He married, firstly,
his first cousin Lady Jane Stewart (1798–1844), daughter of
George Stewart, 8th Earl of Galloway, on 13 January 1819. They had four children: • Lady Louisa Spencer-Churchill (c. 1820–1882), married the Hon. Robert Spencer, son of
Francis Spencer, 1st Baron Churchill, and had issue. •
John Winston Spencer-Churchill, 7th Duke of Marlborough (1822–1883). •
Lord Alfred Spencer-Churchill (1824–1893), married the Hon. Harriet Gough-Calthorpe, daughter of
Frederick Gough, 4th Baron Calthorpe, and had issue. •
Lord Alan Spencer-Churchill (25 July 1825 – 18 April 1873), married Rosalind Dowker. After his first wife's death in October 1844, aged 46, he married, secondly, the Hon. Charlotte Augusta Flower (1818–1850), daughter of
Henry Flower, 4th Viscount Ashbrook, on 10 June 1846. They had two children: • Lord Almeric Athelstan Spencer-Churchill (1847 – 12 December 1856), died young. • Lady Clementina Augusta Spencer-Churchill (4 May 1848 – 27 March 1886), married
John Pratt, 3rd Marquess Camden, and had issue. After his second wife's death in April 1850, aged 31, he married, thirdly, his first cousin Jane Frances Clinton Stewart (1818–1897), daughter of the Hon.
Edward Richard Stewart and granddaughter of
John Stewart, 7th Earl of Galloway, on 18 October 1851. They had one child: • Lord Edward Spencer-Churchill (28 March 1853 – 5 May 1911), married Augusta Warburton, daughter of Major
George Drought Warburton, and had issue. The 6th Duke of Marlborough died at
Blenheim Palace on 1 July 1857, aged 63, and was succeeded by his eldest son,
John. The Duchess of Marlborough died at 28 Grosvenor Street in
Mayfair, London, in March 1897, aged 79. ==Sources==