| | Lewis Payton Holt 1897–1969 Alta Rosa Blackett 1902–1971 | | | | Ellen Margaret Lewis 1859–1942 |
| | | Harvey Valentine Blackett 1876–1957 | | | | John William Blackett 1848–1927 Elizabeth Jane Averett 1854–1931 | | | | Robert Collingwood Blackett 1807–1878 Eleanor (Ellen) Mitchell 1810–1884 | | |
| | | Juduthan Hardy Averett 1816–1902 Holly Jane Tingle 1818–1893 |
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