William Hillier (4th Earl of Onslow) Onslow
1853 - 1911 (58 years)
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| Lady Brigid Katharine Rachel Guinness | |
| B: | 30 Jul 1920 |
| D: | 8 Mar 1995 |
| Prince Frederick of Prussia | |
| B: | 19 Dec 1911 |
| M: | 30 Jul 1945 |
| Little Hadham, Hertfordshire | |
| D: | 20 Apr 1966 |
| Gwendolen Florence Mary Onslow | |
| B: | 22 Jul 1881 |
| D: | 16 February 1966) |
| Rupert Edward Cecil Lee (2nd Earl of Iveagh) Guinness | |
| B: | 29 Mar 1874 |
| M: | 1927 |
| D: | 14 Sep 1967 |
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| William Hillier (4th Earl of Onslow) Onslow | |
| B: | 7 Mar 1853 |
| D: | 23 Oct 1911 |
| Hon Florence Coulston Gardner | |
| B: | Abt 1853 |
| D: | Yes, date unknown |