William Bradford was born 15 April 1688 in Plymouth Colony, Plymouth, Plymouth County, Massachusetts to John Bradford (1653-1736) and Mercy Warren (1657-1727) and died 7 May 1728 Kingston, Plymouth County, Massachusetts of unspecified causes. He married Hannah Foster (1694-1778) 1712 in Plymouth, Plymouth County, Massachusetts.
Children
| Name | Birth | Death | Joined with |
| James Bradford (1717-1801) | |||
| Zadock Bradford (1719-1745) | |||
| Samuel Bradford (1721-1735) | |||
| Elephalet Bradford (1722-1795) | |||
| Hannah Bradford (1724-1756) | |||
| William Bradford (1720-1728) | |||
| Spaulding Bradford (1728-) | |||
Siblings
| Name | Birth | Death | Joined with |
| Joseph Bradford (1676-) | |||
| John Bradford (1675-1724) | |||
| Richard Bradford (1678-) | |||
| Abigail Bradford (1679-1697) | |||
| Mercy Bradford (1681-1738) | |||
| Samuel Bradford (1683-1740) | 23 December 1683 Plymouth, Plymouth County, Massachusetts | 26 March 1740 Plympton, Plymouth County, Massachusetts | Sarah Gray (1697-1770) |
| Priscilla Bradford (1686-1782) | |||
| William Bradford (1688-1728) | 15 April 1688 Plymouth Colony, Plymouth, Plymouth County, Massachusetts | 7 May 1728 Kingston, Plymouth County, Massachusetts | Hannah Foster (1694-1778) |
| James Bradford (1690-) | |||
| Zadoc Bradford (1692-1724) | |||
| Eliphalet Bradford (1695-) | |||
| Alice Bradford (1677-1746) | |||