Biography
Hugh William Grosvenor was born 6 April 1884 in London, Greater London, England, United Kingdom to Hugh Lupus Grosvenor, 1st Duke of Westminster (1825-1899) and Katherine Caroline Cavendish (1857-1941) and died 30 October 1914 Belgium of killed in action. He married Mabel Florence Mary Crichton (1882-1944) 21 April 1906 in London, Greater London, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Gerald Hugh Grosvenor, 4th Duke of Westminster (1907-1967) | 13 February 1907 London, Greater London, England, United Kingdom | 25 February 1967 Cheshire, England, United Kingdom | Sally Perry (1909-1990) |
| Robert George Grosvenor, 5th Duke of Westminster (1910-1979) | 24 April 1910 London, Greater London, England, United Kingdom | 19 February 1979 Ely Lodge, Enniskillen, County Fermanagh, Ireland | Viola Maud Lyttelton (1912-1987) |
Footnotes (including sources)
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