| Father | Frederick Jacobus de Beer (1802 - 1855) |
| Mother | Christina Helena Magdalena Botes (1803 - 1865) |
| Sibling | Samuel Johannes Jacobus de Beer (1817 - 1875) |
| Sibling | Wietse de Beer (1820 - ) |
| Sibling | Barend Lagareas de Beer (1825 - ) |
| Sibling | Mattys Johannes de Beer (1827 - ) |
| Sibling | Antonij Johannes de Beer (1830 - ) |
| Sibling | Anna Maria Elizabeth de Beer (1832 - ) |
| Sibling | Elizabeth Magdalena de Beer (1835 - ) |
| Sibling | Petrus Jacobus de Beer (1837 - ) |
| Sibling | Jan Johannes de Beer (1840 - ) |
| Sibling | Abraham Paulus de Beer (1842 - ) |
| Sibling | Jacob Johannes de Beer (1844 - ) |
| Sibling | Christiaan Johannes de Beer (1848 - ) |