Family: William Fitzwilliam, 4th. Earl Fitzwilliam / Hon. Louisa Molesworth (F2394)
m. 21 Jul 1823William Fitzwilliam, 3rd. Earl Fitzwilliam (1719-1756) 
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Lady Ann Watson-Wentworth ( -1769)
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| Field Marshall Mary Jenney Ussher ( -1763) |
| Hon. Louisa Molesworth (1749-1824)
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| William Fitzwilliam, 4th. Earl Fitzwilliam (1748-1833)
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