| Father | William Cushman Sr. (1710 - 1777) |
| Mother | Abigail Lee (1713 - 1803) |
| Sibling | Solomon Cushman (1733 - 1814) |
| Sibling | Alderton Cushman (1748 - 1826) |
| Sibling | Caleb Cushman (1757 - 1835) |
| Sibling | Sarah Cushman (1731 - 1823) |
| Sibling | Abigail Cushman (1743 - 1825) |
| Sibling | Mary Cushman (1746 - 1827) |
| Sibling | Joseph Cushman (1759 - 1848) |
| Sibling | Job Cushman (1741 - 1760) |
| Sibling | Lydia Cushman (1735 - 1792) |
| Sibling | Joshua Cushman (1750 - 1832) |
| Sibling | William Cushman (1738 - 1818) |
| Sibling | Mary Cushman (1746 - 1810) |
| Sibling | Benjamin Cushman (1753 - 1832) |
| Sibling | Sarah Cushman (1731 - 1820) |
| Sibling | Joab Cushman (1740 - 1760) |