| Father | William Henry Hornby Mp Jp Dl (1805 - 1884) |
| Mother | Margaret Susannah Birley (1810 - 1899) |
| Sibling | John Hornby (1832 - 1901) |
| Sibling | Elizabeth Henriana Hornby (1834 - 1851) |
| Sibling | Frances Mary Hornby (1836 - 1887) |
| Sibling | Edward Kenworthy Hornby J. P. (1839 - 1887) |
| Sibling | Henry Sudell Hornby (1840 - 1840) |
| Sibling | Sir William Henry Hornby D. L. J. P. (1841 - 1928) |
| Sibling | Capt. Cecil Lumsden Hornby (1843 - ) |
| Sibling | Caroline Louisa Hornby (1845 - ) |
| Sibling | Albert Neilson Hornby J. P. (1847 - 1925) |
| Sibling | Charles Herbert Hornby (1849 - ) |