Mary Leonard Brigham was born 13 December 1674 in Bridgewater, Plymouth County, Massachusetts to Samuel Leonard (1643-1720) and Abigail Atwood (1647-1698) and died 1 December 1741 Westborough, Worcester County, Massachusetts of unspecified causes. She married David Brigham (1678-1750) 21 October 1709 in Marlborough, Middlesex County, Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Silas Brigham (1710-1791) | 9 August 1710 Marlborough, Middlesex County, Massachusetts, United States | 11 March 1791 Westborough, Worcester County, Massachusetts, United States | Mindwell Grout (1717-1741) Tabitha Prescott (1710-1801) |
| Jemima Brigham (1712-1777) | |||
| Deborah Brigham (1714-1779) | |||
| Levi Brigham (1716-1787) | 21 August 1716 Marlborough, Middlesex County, Massachusetts | 1 February 1787 Fitzwilliam, Cheshire County, New Hampshire | Susanna Grout (1719-1816) |
| Jonas Brigham (1718-1789) | 25 February 1718 Westborough, Worcester County, Massachusetts, United States | 25 September 1789 Westborough, Worcester County, Massachusetts, United States | Persis Baker (1726-1784) |
| Asa Brigham (1721-1777) | |||
Siblings
| Name | Birth | Death | Joined with |
| Mary Leonard (1674-1741) | 13 December 1674 Bridgewater, Plymouth County, Massachusetts | 1 December 1741 Westborough, Worcester County, Massachusetts | David Brigham (1678-1750) |
| Elisabeth Leonard (1680-1746) | |||
| Samuel Leonard (1683-1718) | |||
| Mercy Leonard (1683-1749) | |||
| Abigail Leonard (1700-1729) | |||
| Phoebe Leonard (1703-) | |||