Family: William Fitzwilliam, 4th. Earl Fitzwilliam / Lady Charlotte Ponsonby (F2393)
m. 10 Jul 1770William Fitzwilliam, 3rd. Earl Fitzwilliam (1719-1756) 
|
Lady Ann Watson-Wentworth ( -1769)
|
| William Ponsonby, 2nd. Earl of Bessborough (1704-1793)
|
| Caroline Cavendish (1719-1760)
|
Lady Catherine Ponsonby (1742-1789)  |
| Frederick Ponsonby, 3rd. Earl of Bessborough (1758-1844) |
| William Fitzwilliam, 4th. Earl Fitzwilliam (1748-1833)
|
| Lady Charlotte Ponsonby (1750-1822)
|