John Mersereau Jr. was born 30 June 1734 in New Dorp, New York, United States to John Mersereau (1705-1774) and Elizabeth Creage Mersereau (1709-1774) and died 9 July 1818 Maugerville, New Brunswick, Canada of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| Andrew Mersereau (1764-1852) | 2 September 1764 Chautauqua, New York, United States | 29 September 1852 Maugerville, New Brunswick, Canada | Elizabeth Bartlett (1768-1812) |
Siblings
| Name | Birth | Death | Joined with |
| John M. Mersereau (1734-1818) | 30 June 1734 New Dorp, New York, United States | 9 July 1818 Maugerville, New Brunswick, Canada | Gertrude Charity Van Horn (1737-1822) |