Algernon Percy 1st Earl of Beverley (1790), 2nd Baron Lovaine (1784), Baron of Alnwick, M.P. 1749–1830 Isabella Susannah Burrell Baroness Lovaine (1786) and Countess Beverley (1790) 1750–1812 | | |
Hugh Percy 2nd Duke of Northumberland, 3rd Baron Percy, 5th Bt., K.G., M.P. 1742–1817 Frances Julia Burrell Duchess of Northumberland 1752–1820 | | |
| | Elizabeth Seymour Duchess of Northumberland and 2nd Baroness Percy 1716–1776 Hugh Smithson (later Percy) 1715–1786 | | | | Algernon Seymour 1684–1750 |
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