William married Sarah Tabitha Osteen on 30 Aug 1849 in Franklin County, Illinois, USA. Sarah was born on 18 Sep 1828 in Williamson County, Illinois, USA; died on 23 Oct 1852 in Williamson County, Illinois, USA; was buried in Duncan Cemetery, Williamson County, Illinois, USA. [Group Sheet] [Family Chart]

1. Joseph W Duncan was born on 18 Aug 1850 in Illinois, USA; died on 1 Jan 1870 in Marshall County, Kansas, USA; was buried in Life Cemetery, Beattie, Marshall, Kansas, USA.
2. Sarah Tabitha Duncan was born on 23 Oct 1852 in Williamson County, Illinois, USA; died on 23 Oct 1852 in Williamson County, Illinois, USA.

William married Martha Barbara Kinser on 13 Jun 1853 in Carbondale, Jackson, Illinois, USA. Martha (daughter of Adam C Kinser and Anna Stultz) was born on 24 Dec 1832 in Nashville, Davidson, Tennessee, USA; died on 6 Apr 1920 in Mariposa, Mariposa, California, USA; was buried in Mariposa District Cemetery, Mariposa, Mariposa, California, USA. [Group Sheet] [Family Chart]

1. Charles Walter Duncan was born on 14 Oct 1857 in Carbondale, Jackson, Illinois, USA; died on 17 Jun 1875 in Mariposa, Mariposa, California, USA.
2. Henry Lewis Duncan was born in 1854 in Carbondale, Jackson, Illinois, USA; died on 16 Dec 1879 in Mariposa, Mariposa, California, USA.
3. Martha Adelia Duncan was born on 30 Nov 1874 in Beattie, Marshall, Kansas, USA; died on 29 Mar 1875 in Beattie, Marshall, Kansas, USA; was buried in Life Cemetery, Beattie, Marshall, Kansas, USA.
4. Sarah Tabitha Duncan was born on 29 Dec 1855 in Clay Center, Clay, Kansas, USA; died on 15 Jan 1931 in Fresno County, California, USA.
5. George Washington Duncan was born on 21 Feb 1873 in Marshall County, Kansas, USA; died on 3 Nov 1873 in Marshall County, Kansas, USA; was buried in Life Cemetery, Beattie, Marshall, Kansas, USA.
6. Anna May Duncan was born on 17 Nov 1866 in Kansas City, Wyandotte, Kansas, USA; died on 31 Oct 1935 in Spokane, Spokane, Washington, USA; was buried in Marshall Cemetery, Spokane, Spokane, Washington, USA.
7. Ida Belle Duncan was born on 23 Sep 1869 in Marshall County, Kansas, USA; died on 10 Dec 1955 in Willows, Glenn, California, USA; was buried in Willows Cemetery, Willows, Glenn, California, USA.
8. John A Logan Duncan was born in Mar 1862 in Illinois, USA; died on 21 Sep 1913 in Mariposa, Mariposa, California, USA.
9. William Benson Duncan, Jr was born on 26 Apr 1871 in Kansas City, Wyandotte, Kansas, USA; died on 5 May 1936 in Merced, Merced, California, USA; was buried in Helm-Turner Cemetery, Le Grand, Merced, California, USA.
10. Barbara Ann Duncan was born on 7 Apr 1860 in Carbondale, Jackson, Illinois, USA; died on 12 Nov 1943 in San Diego County, California, USA; was buried in El Camino Memorial Park, San Diego, San Diego, California, USA.
11. Ninian Edward Duncan, Sr was born on 2 May 1877 in Mariposa County, California, USA; died on 16 Jan 1944 in Fresno, Fresno, California, USA; was buried in Tollhouse Cemetery, Tollhouse, Fresno, California, USA.
12. Louisa Marian Duncan was born on 30 Aug 1864 in Marshall County, Kansas, USA; died on 21 Feb 1928 in Sacramento, Sacramento, California, USA; was buried in Merced Cemetery, Merced, Merced, California, USA.

Dudley married Elizabeth Spiller on 4 Sep 1828. Elizabeth was born on 3 Jan 1812 in Robertson County, Tennessee, USA; died on 24 Feb 1854 in Illinois, USA. [Group Sheet] [Family Chart]

Henry married Mary Ann duncan on 7 Oct 1805 in Salem, Livingston, Kentucky, USA. [Group Sheet] [Family Chart]

Martin married Elizabeth Wright. Elizabeth was born in 1759 in Washington County, Virginia, USA; died on 5 Sep 1782 in Robertson County, Tennessee, USA. [Group Sheet] [Family Chart]