Sarah Margetson COLVILL
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| Honourable Louisa O'CALLAGHAN | |
| D: | 1863 |
 | William CAVENDISH 1783-1812 |
| William CAVENDISH | |
| B: | 10 Jan 1783 |
| M: | 18 Jul 1807 |
| D: | 17 Jan 1812 |
| Holker Park, Lancashire, England | |
| John PONSONBY 1713-1787 |
| John PONSONBY | |
| B: | 29 Mar 1713 |
| D: | 16 Aug 1787 |
| Lady Elizabeth CAVENDISH Bef 1727-1796 |
| Lady Elizabeth CAVENDISH | |
| B: | Bef 1727 |
| M: | 1743 |
| D: | 1796 |