| Father | Andrew Jackson Duncan (1814 - ) |
| Mother | Nancy Jane Johnston ( - ) |
| Sibling | Elizabeth Jane Duncan (1840 - 1840) |
| Sibling | Keziah R Duncan (1841 - ) |
| Sibling | Margaret A Duncan (1842 - 1847) |
| Sibling | James M Duncan (1844 - 1865) |
| Sibling | Samuel K Duncan (1845 - 1846) |
| Sibling | Esther A Duncan (1846 - ) |
| Sibling | William Andrew Duncan (1849 - ) |
| Sibling | Sarah J Duncan (1850 - 1850) |
| Sibling | Nancy J Duncan (1852 - 1852) |
| Sibling | Wiley Duncan (1855 - 1855) |
| Sibling | Mahala G Duncan (1857 - ) |
| Sibling | Mary Pomeroy Duncan (1858 - ) |
| Sibling | Malisia Duncan (1861 - ) |
| Sibling | Clara J Duncan (1862 - 1862) |