| Father | Samuel Leffingwell Jr. (1718 - 1799) |
| Mother | Mercy Gorton (1720 - ) |
| Sibling | Wealthy Leffingwell (1740 - ) |
| Sibling | Wealthy Leffingwell (1740 - ) |
| Sibling | Benjamin Leffingwell (1743 - 1826) |
| Sibling | Roswell Leffingwell (1745 - 1794) |
| Sibling | Samuel Leffingwell (1747 - 1823) |
| Sibling | Elizabeth Leffingvell (1747 - 1747) |
| Sibling | Anna Leffingwell (1748 - 1778) |
| Sibling | Daniel Leffingwell (1748 - 1748) |
| Sibling | Hannah Leffingwell (1749 - ) |
| Sibling | Abigail Leffingwell (1752 - 1810) |
| Sibling | Judith Leffingwell (1754 - 1754) |
| Sibling | Hannah Leffingwell (1755 - 1756) |
| Sibling | Mary Leffingwell (1756 - ) |
| Sibling | Lydia Leffingwell (1757 - 1757) |
| Sibling | Asa Leffingwell (1758 - 1758) |
| Sibling | Sarah Leffingwell (1762 - 1762) |