| Father | John Odell Northrop (1828 - 1909) |
| Mother | Ellen Barbour (1830 - ) |
| Sibling | Helen Selina Northrop (1856 - ) |
| Sibling | Thomas Barnes Northrop (1857 - 1859) |
| Sibling | Harriett Bicknell Northrop (1860 - 1935) |
| Sibling | Mary Wheeler Northrop (1879 - ) |
| Sibling | John Blair Northrop (1852 - 1872) |
| Sibling | Horace Barber Northrop (1854 - ) |
| Sibling | William Stuart Northrop (1863 - 1941) |
| Sibling | Louis Allan Northrop (1865 - ) |
| Sibling | Hiram Barnes Northrop (1860 - 1862) |
| Sibling | Charlotte G. Northrop (1866 - 1943) |
| Sibling | Edward Worcester Northrop (1871 - 1957) |
| Sibling | Evelyn Hazleton Northrop (1874 - 1950) |
| Sibling | Eugene Goodrich Northrup (1878 - 1946) |