| Father | John Christopher Baron Lethbridge (1839 - 1885) |
| Mother | Millicent Galton Bunbury (1846 - 1942) |
| Sibling | Edward Galton Baron Lethbridge (1867 - 1932) |
| Sibling | John Charles Henry Baron Lethbridge (1868 - 1868) |
| Sibling | Emma Elizabeth Adele Baron Lethbridge (1870 - 1871) |
| Sibling | John Guy Baron Lethbridge (1873 - ) |
| Sibling | Robert Christopher Baron Lethbridge (1875 - 1924) |
| Sibling | Charles Francis Baron Lethbridge (1877 - 1934) |
| Sibling | Frederick Shirley Baron Lethbridge (1879 - 1907) |
| Sibling | Hugh Copland Baron Lethbridge (1880 - 1952) |