| Father | Maj Gen Benedict ARNOLD V (1741 - 1801) |
| Mother | Margaret "Peggy" SHIPPEN (ARNOLD) (1760 - 1804) |
| Sibling | Edward Neddy ARNOLD (1780 - 1781) |
| Sibling | Lieutenant Edward Shippen ARNOLD (1780 - 1813) |
| Sibling | Major General James Robertson ARNOLD (1781 - 1854) |
| Sibling | Margaret ARNOLD (1783 - 1783) |
| Sibling | George ARNOLD (1784 - 1784) |
| Sibling | Sophia Matilda ARNOLD (PHIPPS) (1785 - 1828) |
| Sibling | John Sage ARNOLD (1786 - 1831) |
| Sibling | Lieutenant-Colonel George ARNOLD (1787 - 1828) |
| Sibling | Margaret ARNOLD (1788 - 1871) |
| Sibling | Captain William Fitch ARNOLD (1794 - 1846) |