Algernon George Percy, 6th Duke of Northumberland was born 20 May 1810 to George Percy, 5th Duke of Northumberland (1778-1867) and Louisa Harcourt Stuart-Wortley (1781-1848) and died 2 January 1899 of unspecified causes. He married Louisa Drummond (1813-1890) 26 May 1845 .
Children
| Name | Birth | Death | Joined with |
| Mary Jane Brown Percy (1839-1901) | |||
| Henry George Percy, 7th Duke of Northumberland (1846-1918) | 29 May 1846 London, England, United Kingdom | 14 May 1918 | Edith Campbell (1849-1913) |
| Algernon Malcolm Arthur Percy (1851-1933) | |||
Siblings
| 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) | |||