| Father | George Washington DUNCAN (1832 - 1911) |
| Mother | Lorinda Anzaline FAUSET (1843 - 1926) |
| Sibling | George Grant DUNCAN (1864 - 1926) |
| Sibling | Ida Elmina DUNCAN (1866 - 1892) |
| Sibling | Matilda Ella DUNCAN (1867 - 1944) |
| Sibling | Lorinda Eva DUNCAN (1869 - 1954) |
| Sibling | Alice Maude DUNCAN (1870 - ) |
| Sibling | Viola M. DUNCAN (1872 - 1959) |
| Sibling | Earl Edgar DUNCAN (1875 - 1875) |
| Sibling | Laura Eugenia DUNCAN (1876 - 1931) |
| Sibling | Eugene Manfred DUNCAN (1877 - 1878) |
| Sibling | Alpharetta Naomi DUNCAN (1880 - 1968) |
| Sibling | Laurence Hopeton DUNCAN (1885 - 1906) |