| Father | James Duncan (1801 - 1874) |
| Mother | Christian (Christina) Chalmers (1805 - 1889) |
| Sibling | John Duncan (1824 - 1874) |
| Sibling | Robert Duncan (1826 - 1855) |
| Sibling | Isabella Duncan (1828 - 1911) |
| Sibling | Agnes Duncan (1830 - 1915) |
| Sibling | Christina Duncan (1832 - 1908) |
| Sibling | Andrew Duncan (1833 - 1914) |
| Sibling | Marion Duncan (1834 - 1863) |
| Sibling | William Chalmers Duncan (1836 - 1919) |
| Sibling | Catherine Duncan (1838 - 1919) |
| Sibling | Alexander Duncan (1839 - 1916) |
| Sibling | John Alexander Duncan (1839 - 1916) |
| Sibling | Andrew Duncan (1841 - ) |
| Sibling | Jean Duncan (1841 - 1926) |
| Sibling | Joseph Duncan (1843 - 1903) |
| Sibling | Anna Duncan (1845 - 1922) |
| Sibling | Agnes Duncan (1847 - ) |
| Sibling | Helen Duncan (1849 - 1863) |