Duncan married Julia McDowell on 4 Nov 1869 in Blyth, Ontario, Canada. Julia (daughter of William J, McDowell, Sr. and Phoebe Euphemenia Densmore) was born on 10 May 1852 in Lancaster, New York, USA; died on 27 Sep 1932 in Freeland, Michigan, USA; was buried on 29 Sep 1932 in Pine Grove Cemetery, Freeland, Michigan, USA. [Group Sheet] [Family Chart]

1. Phoebe Jane McKellar was born on 2 Oct 1870 in East Wawanosh Township, Ontario, Canada; died on 8 Mar 1914 in Saginaw, Michigan, USA; was buried in West Side Cemetery, Freeland, Michigan, USA.
2. Effie Caroline McKellar was born on 9 May 1873 in Tittabawassee Township, Saginaw County, Michigan, USA; died on 21 Nov 1974 in Detroit, Michigan, USA; was buried in Pine Grove Cemetery, Freeland, Michigan, USA.
3. Mary Catherine McKellar was born on 8 Aug 1875 in Freeland, Michigan, USA; died in Sep 1951 in Saginaw, Michigan, USA; was buried in Pine Grove Cemetery, Freeland, Michigan, USA.
4. William Angus McKellar was born on 11 Oct 1878 in Tittabawassee Township, Saginaw County, Michigan, USA; died on 5 Nov 1967 in Bay City, Michigan, USA; was buried in Pine Grove Cemetery, Freeland, Michigan, USA.
5. Albert A. McKellar was born on 24 May 1881 in Saginaw County, Michigan, USA; died on 30 Aug 1962 in Saginaw, Michigan, USA; was buried in Pine Grove Cemetery, Freeland, Michigan, USA.
6. Margaret B. McKellar was born on 12 Jul 1884 in Tittabawassee Township, Saginaw County, Michigan, USA; died on 25 Dec 1941 in Freeland, Michigan, USA; was buried in West Side Cemetery, Freeland, Michigan, USA.