Family: Maj Gen Sir Thomas Sydney Beckwith / Mary Douglas (F2845)
m. 1817
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 | Sir George Beckwith (1753-1823) |
| Sir William (4th Bt of Kelhead) Douglas (1730-1783)
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 | Grace (of Lockerbie) Johnston (1746-1826)
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| Christian Douglas (1774-1847) |
| Catherine Heron Douglas (1775- ) |
| Charles (6th Marquess of Queensbury) Douglas (1777-1837)  |
| Archibald William Johnstone Douglas (1778-1796) |
| John (7th Marquess of Queensbury) Douglas (1779-1856) |
| Henry Alexander Douglas (1781-1837) |
| Lord William Robert Keith Douglas (1783-1859) |
| Maj Gen Sir Thomas Sydney Beckwith (1772-1831)
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| Mary Douglas (1773-1841)
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| Thomas Sydney Beckwith ( -1828) |