| Father | Male Senator Jonathan Mason, Jr. |
| Born | 12 Sep 1756 | Boston, Suffolk County, Massachusetts  |
| Died | 1 Nov 1831 | Boston, Suffolk County, Massachusetts |
| Buried | ||
| Married | 13 Apr 1779 | Boston, Suffolk County, Massachusetts |
| Father | Jonathan Mason | F38402 Group Sheet | |
| Mother | Miriam Kilby Clarke | F38402 Group Sheet | |
| Mother | Female Susannah Powell |
| Born | 16 Sep 1760 | Massachusetts |
| Died | 30 Jan 1836 | Boston, Suffolk County, Massachusetts |
| Buried | ||
| Father | William Powell | F38403 Group Sheet | |
| Mother | Mary Bromfield | F38403 Group Sheet | |
| Child 1 | Male William Powell Mason |
| Born | 9 Dec 1791 | Boston, Suffolk County, Massachusetts |
| Died | 4 Dec 1867 | Cambridge, Middlesex County, Massachusetts |
| Buried | ||
| Spouse | Hannah Rogers | F38366 | |
| Married | 14 Sep 1831 | Boston, Suffolk County, Massachusetts |
