Jane Tillie Levi 1918–1995 | | |
| | William Tracy Blackett 1895–1927 Della May Chase 1894–1967 | | | | Joseph Francis Blackett 1850–1901 Alice Geraldine Alexander 1856–1931 | | | | Robert Collingwood Blackett 1807–1878 Eleanor (Ellen) Mitchell 1810–1884 | | |
| | | Horace Martin Alexander 1812–1881 |
|
|
|
|