| | Thomas Francis Blackwell 1912–1983 | | |
John Geoffrey Blackwell 1914–2000 | | |
Charles Arthur Blackwell 1917–1940 | | |
Shirley Anne Blackwell 1919– | | |
| | Shirley Maud Lawson-Johnston 1889–1978 Thomas Geoffrey Blackwell 1884–1943 | | | | Thomas Francis Blackwell 1838–1907 | | | | Thomas Blackwell 1804–1879 Jane Ann Bernasconi 1801–1870 | | | | Charles Blackwell 1769–1849 Mary Ann Bodimeade 1771–1862 | | |
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