| Lord Grosvenor|| October 30, 1914, Belgium|
| Robert Grosvenor, 5th Duke of Westminster|
Gerald Grosvenor, 6th Duke of Westminster
Hugh Grosvenor, Earl Grosvenor
Captain Lord Hugh William Grosvenor (6 April 1884 – 30 October 1914) was the son of Hugh Grosvenor, 1st Duke of Westminster and his second wife, formerly The Hon. Katherine Cavendish.
Lord Hugh Grosvenor Wikipedia
Grosvenor was the commander of C Squadron, 1st Life Guards, and was killed in action, aged thirty, during World War I. Having no known grave, he is commemorated on the Menin Gate Memorial, Ypres.
He married Lady Mabel Crichton, daughter of John Crichton, 4th Earl Erne and his wife, the former Lady Florence Cole, daughter of William Cole, 3rd Earl of Enniskillen, on 21 April 1906.
Children of Lord and Lady Hugh Grosvenor:Gerald Hugh Grosvenor (1907–1967), later 4th Duke of Westminster
Robert George Grosvenor (1910–1979), later 5th Duke of Westminster
He was one of a number of British polo players who died in World War I.