Joseph Bemis, Jr. was born 10 April 1723 in Watertown, Middlesex County, Massachusetts to Joseph Bemis (1684-1738) and Elizabeth Pierce (1687-1753) and died 1800 Waltham, Middlesex County, Massachusetts of unspecified causes. He married Ruth Simonds (1727-1800) 1745 in Massachusetts.
Children
| Name | Birth | Death | Joined with |
| Ruth Bemis (1746-) | |||
| Joseph Bemis (1748-1825) | |||
| Abigail Bemis (1750-) | |||
| Elizabeth Bemis (1750-1818) | |||
| Sarah Bemis (1753-) | |||
| Charity Bemis (1755-1818) | |||
| Sylvester Bemis (1761-1831) | 25 November 1761 Waltham, Middlesex County, Massachusetts | 23 February 1831 Chester, Hampden County, Massachusetts | Molley Bemis (1765-1847) |
| Phebe Bemis (1763-) | |||
| Mary Bemis (1765-1849) | |||
Siblings
| Name | Birth | Death | Joined with |
| Elizabeth Bemis (1707-1745) | |||
| Mary Bemis (1709-1738) | |||
| Sarah Bemis (1711-) | |||
| Susannah Bemis (1714-) | |||
| Dinah Bemis (1718-1802) | |||
| Abigail Bemis (1720-) | |||
| Joseph Bemis (1723-1800) | 10 April 1723 Watertown, Middlesex County, Massachusetts | 1800 Waltham, Middlesex County, Massachusetts | Ruth Simonds (1727-1800) |
| Benjamin Bemis (1725-1793) | 19 April 1725 Watertown, Middlesex County, Massachusetts | 7 March 1793 Cornish City, Sullivan County, New Hampshire, United States | Sarah Garfield (1723-1797) |
| Kezia Bemis (1726-1755) | |||