| Father | William Pekin DUNCAN (1840 - 1907) |
| Mother | Mary Ellen SANDERS (1846 - 1891) |
| Sibling | Kate DUNCAN (1865 - 1932) |
| Sibling | William Tilden DUNCAN (1866 - 1944) |
| Sibling | James Hazard DUNCAN (1867 - 1888) |
| Sibling | Minnie DUNCAN (1870 - 1870) |
| Sibling | Zada DUNCAN (1873 - 1908) |
| Sibling | Warren Leslie DUNCAN (1875 - 1965) |
| Sibling | Donald Jean DUNCAN (1876 - 1950) |
| Sibling | George Werner DUNCAN (1877 - 1877) |
| Sibling | Gerald Hampton DUNCAN (1878 - 1878) |
| Sibling | Robert Harold DUNCAN (1879 - 1967) |
| Sibling | Ernest Bertram DUNCAN (1881 - 1881) |
| Sibling | Marion DUNCAN (1883 - 1883) |
| Sibling | Unknown DUNCAN (1888 - 1888) |