Biography
Sibell Mary Lumley was born 24 March 1855 in Tickhill, South Yorkshire, England, United Kingdom to Richard George Lumley, 9th Earl of Scarbrough (1813-1884) and Frederica Mary Adeliza Drummond (1826-1907) and died 4 February 1929 Saighton Grange, Saighton, Cheshire, England, United Kingdom of unspecified causes. She married Victor Alexander Grosvenor (1853-1884) 3 November 1874 in London, Greater London, England, United Kingdom. She married George Wyndham (1863-1913) 7 February 1887 in London, Greater London, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Constance Sibell Grosvenor (1875-1957) | 22 August 1875 Cliveden, Buckinghamshire, England, United Kingdom | 8 July 1957 Westminster, Greater London, England, United Kingdom | Anthony Ashley-Cooper, 9th Earl of Shaftesbury (1869-1961) |
| Lettice Mary Elizabeth Grosvenor (1876-1936) | 25 December 1876 Cliveden, Taplow, Buckinghamshire, England, United Kingdom | 28 July 1936 Saighton Grange, Saighton, Cheshire, England, United Kingdom | William Lygon, 7th Earl Beauchamp (1872-1938) |
| Hugh Richard Arthur Grosvenor, 2nd Duke of Westminster (1879-1953) | 19 March 1879 | 19 July 1953 | Constance Edwina Cornwallis-West (1875-1970) Violet Mary Nelson (1891-1983) Loelia Mary Ponsonby (1902-1993) Anne Winifred Sullivan (1915-2003) |
| Name | Birth | Death | Joined with |
| Percy Lyulph Wyndham (1887-1914) | |||
Footnotes (including sources)
| ‡ General |
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