John married Mary McDonell. Mary was born , Wexford, County Wexford, Ireland; died 1916, Topsail, Conception Bay South, Newfoundland and Labrador, Canada. [Group Sheet]

1. Richard O'Brien was born 1852, Topsail, Conception Bay South, Newfoundland and Labrador, Canada; died 25 Aug 1911, Topsail, Conception Bay South, Newfoundland and Labrador, Canada.
2. Mary Bridget O'Brien was born 1900; died Deceased.
3. Thomas O'Brien was born Abt. 1846, Topsail, Newfoundland, Canada; died Deceased.
4. James O'Brien was born Abt. 1836, Topsail, C. B. NL.; died 9 Jul 1918, Topsail, CBS, Newfoundland, Canada.
5. Ellen O’Brien
6. Edward O'Brien
7. William O'Brien