| Father | Rev Arthur John Biddell (1824 - 1880) |
| Mother | Maria Gregson Willoughby (1831 - 1920) |
| Sibling | Maria Florance Willoughby Biddell (1855 - 1886) |
| Sibling | Harry Clifford Biddell (1856 - 1925) |
| Sibling | Laura Ann Biddell (1858 - ) |
| Sibling | Arthur Willoughby Biddell (1859 - 1913) |
| Sibling | Elenor Clifford Biddell (1862 - ) |
| Sibling | Francis Hugh Biddell (1862 - ) |
| Sibling | Cecil Henry Booth Biddell (1864 - 1897) |
| Sibling | Alice Molesworth Biddell (1866 - ) |
| Sibling | Robert Lawrence Biddell (1868 - ) |
| Sibling | Mary Cicely Willoughby Biddell (1870 - 1949) |
| Sibling | Sidney C. Biddell (1871 - ) |