John George Blackett Dawson 1821– | | |
| | William Mackenzie Dawson 1793–1859 | | | | | | | | | | | | Christopher Blackett 1687–1764 | | | | Sir Edward Blackett 1649–1718 | | |
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| | | Sir Edward Blackett 1719–1804 | | | | | | | | Sir Edward Blackett 1649–1718 | | |
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| | | John Dawson , Earl of Portarlington 1744–1798 Lady Caroline Stuart 1750–1813 | | | | John Stuart 3rd Earl of Bute 1713–1792 Mary Wortley-Montagu Baroness Mount Stuart of Wortley 1718–1794 |
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