George Percy, 5th Duke of Northumberland was born 22 June 1778 to Algernon Percy, 1st Earl of Beverley (1750-1830) and Isabella Susannah Burrell (1750-1812) and died 22 August 1867 of unspecified causes. He married Louisa Harcourt Stuart-Wortley (1781-1848) 22 June 1801 .
Children
| Name | Birth | Death | Joined with |
| Louisa Percy (c1802-1883) | |||
| Algernon James Percy (-1805) | |||
| Henry Algernon Pitt Percy (-1809) | |||
| Margaret Percy (-1810) | |||
| Algernon George Percy, 6th Duke of Northumberland (1810-1899) | 20 May 1810 | 2 January 1899 | Louisa Drummond (1813-1890) |
| Josceline William Percy (1811-1881) | |||
| Henry Hugh Manvers Percy (1817-1877) | |||
| Margaret Percy (c1825-1897) | |||
Siblings
| Name | Birth | Death | Joined with |
| George Percy, 5th Duke of Northumberland (1778-1867) | 22 June 1778 | 22 August 1867 | Louisa Harcourt Stuart-Wortley (1781-1848) |
| Algernon Percy (1779-1833) | |||
| Hugh Percy (1784-1856) | |||
| Josceline Percy (1784-1856) | |||
| Henry Percy (1785-1825) | |||
| William Henry Percy (1788-1855) | |||
| Francis John Percy (1790-1812) | |||
| Charles Greatheed Bertie Percy (1794-1870) | |||
| Charlotte Percy (-1862) | |||
| Emily Charlotte Percy (-1877) | |||
| Elizabeth Percy (-1779) | |||
| Louisa Margaret Percy (-1796) | |||