Robert Grosvenor, 1st Marquess of Westminster, was born 22 March 1767 in St George Hanover Square, Greater London, England, United Kingdom to Richard Grosvenor, 1st Earl Grosvenor (1731-1802) and Henrietta Vernon (-1828) and died 17 February 1845 Eaton Hall, Cheshire, England, United Kingdom of unspecified causes. He married Eleanor Egerton (1770-1846) 28 April 1794 .
|Richard Grosvenor, 2nd Marquess of Westminster (1795-1869)||27 January 1795 Millbank House, Westminster, Greater London, England, United Kingdom||31 October 1869 Fonthill House, Fonthill Gifford, Wiltshire, England, United Kingdom||Elizabeth Mary Leveson-Gower (1797-1891)|
|Thomas Grosvenor Egerton, 2nd Earl of Wilton (1799-1882)||30 December 1799||7 March 1882||Mary Margaret Stanley (1801-1858) |
Susan Isabella Smith (1834-1816)
|Robert Grosvenor, 1st Baron Ebury (1801-1893)||24 April 1801 Westminster, Greater London, England, United Kingdom||18 November 1893 Westminster, Greater London, England, United Kingdom||Charlotte Arbuthnot Wellesley (1808-1891)|
|Mary Grosvenor (1802-)|