Duncan married Etta May Alexander on 25 Jan 1910 in Boston, Suffolk, Massachusetts, USA. Etta (daughter of Albert Francis Alexander and Clara Adeline Fuller) was born on 6 Aug 1891 in Boston, Suffolk, Massachusetts, USA; died on 23 Sep 1957 in Boston, Suffolk, Massachusetts, USA; was buried on 26 Sep 1957 in Greenwood Cemetery, Haverhill, Essex, Massachusetts, USA. [Group Sheet] [Family Chart]

1. Edna Lucille Campbell was born on 11 Dec 1910 in Boston, Suffolk, Massachusetts, USA; died on 27 Apr 1981 in Quincy, Norfolk, Massachusetts, USA; was buried on 30 Apr 1981 in Hanson, Plymouth, Massachusetts, USA.
2. Claire Louise Campbell was born on 31 Jul 1921 in Boston, Suffolk, Massachusetts, USA; died on 10 Dec 1982 in Hanson, Plymouth, Massachusetts, USA; was buried on 13 Dec 1982 in Woodlawn Cemetery, Everett, Middlesex, Massachusetts, USA.
3. D. Campbell
4. E. Campbell