Oswell married Abigail Rachel Fillmore 17 Jul 1851, , Albert, New Brunswick, Canada. Abigail (daughter of Asa Fillmore and Sarah Tingley) was born 15 Feb 1834, Cloverdale Parish, Albert, New Brunswick, Canada; died 6 Feb 1919, Havelock, , New Brunswick, Canada. [Group Sheet]

1. Asa Harding Keith was born 1 Aug 1854, Havelock, Kings, New Brunswick, Canada; died 17 Dec 1936, Pownal, Cumberland, Maine, United States; was buried 20 Dec 1936, Pownal, Cumberland, Maine, United States.
2. Joshua Merritt Keith was born 27 Aug 1856, Havelock, Kings, New Brunswick, Canada; died 27 Mar 1939, Havelock, Kings, New Brunswick, Canada; was buried , Green Hill Cemetery, Havelock, , New Brunswick, Canada.
3. Clifford Allaby Keith was born 14 Apr 1858, Havelock, Kings, New Brunswick, Canada; died 2 Nov 1939.
4. Alfretta Lairnia Keith was born 27 Apr 1861, Havelock, Kings, New Brunswick, Canada; died 27 Jan 1923, Boston, Suffolk, Massachusetts, United States; was buried , Woodlawn Cemetery, near Boston, , Massachusetts, United States.
5. Cyrintha Narcissus Keith was born 16 Dec 1863, Havelock, Kings, New Brunswick, Canada; died 27 Apr 1952, West Medford, , Massachusetts, United States; was buried , Oak Grove Cemetery, South Boston, Massachusetts, United States.
6. Sarah Victoria Keith was born 30 Sep 1866, Havelock, , New Brunswick, Canada; died 22 Apr 1918, Detroit, , Michigan, United States; was buried , Evergreen Cemetery, Detroit, , Michigan, United States.
7. Howard R Keith was born 15 Feb 1871, Havelock, Kings, New Brunswick, Canada; died 3 Sep 1952.
8. Myles Herbert Alexander Keith was born 22 May 1875, Havelock, , New Brunswick, Canada; died 24 Feb 1950, Detroit, , Michigan, United States; was buried , Roseland Park Cemetery, Royal Oak, , Michigan, United States.