Joseph Morton, Jr. was born 25 October 1712 in Plymouth, Plymouth County, Massachusetts to Joseph Morton (1683-1754) and Mary Chittenden (1685-1756) and died 26 July 1793 Groton, Middlesex County, Massachusetts of unspecified causes. He married Anna Bullock (1722-1759) 2 August 1738 in Plymouth County, Massachusetts. He married Abigail Hersey (1727-1793) 26 December 1759 in Boston, Suffolk County, Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Diamond Morton (1741-1792) | |||
| Hannah Morton (1743-1820) | |||
| Abigail Morton (1745-) | |||
| Anna Morton (1746-) | |||
| Perez Morton (1751-1837) | 13 November 1751 Plymouth, Plymouth County, Massachusetts, United States | 14 October 1837 Dorchester, Suffolk County, Massachusetts, United States | Sarah Wentworth Apthorp (1759-1846) |
| Joseph Morton (1752-) | |||
| Lucy Morton (1754-1803) | |||
| Ephraim Morotn (1754-) | |||
| Name | Birth | Death | Joined with |
| Abigail Morton (1760-1817) | |||
| Joseph Morton (1764-1843) | |||
| Ephraim Morton (1768-1793) | |||
Siblings
| Name | Birth | Death | Joined with |
| Joseph Morton (1710-1711) | |||
| Joseph Morton (1712-1793) | 25 October 1712 Plymouth, Plymouth County, Massachusetts | 26 July 1793 Groton, Middlesex County, Massachusetts | Anna Bullock (1722-1759) Abigail Hersey (1727-1793) |
| Hannah Morton (1713-) | |||
| Ezekiel Morton (1718-1796) | |||