1912 - 1987 (74 years)
| 6th Duke of Westminster Gerald Cavendish GROSVENOR | |
| B: | 22 Dec 1951 |
| Omagh, Co. Tyrone, Ireland | |
| D: | 10 Aug 2016 |
| Abbeystead, Lancs | |
|
| Viola Maud LYTTELTON | |
| B: | 10 Jun 1912 |
| Putney, London SW | |
| D: | 3 May 1987 |
| Dungannon, Co. Tyrone, Ireland | |
| 5th Duke of Westminster Robert George GROSVENOR | |
| B: | 24 Apr 1910 |
| M: | 3 Dec 1946 |
| D: | 19 Feb 1979 |
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