Nathaniel Underhill was born 11 August 1690 in New Castle, Westchester County, New York, USA to Nathaniel Underhill (1663-1710) and Mary Ferris (1662-1715) and died 27 November 1775 Yorktown, Westchester County, New York, USA of unspecified causes. He married Mary Hunt (1692-1775) 29 May 1712 .
Children
| Name | Birth | Death | Joined with |
| Phoebe Underhill (1712-1775) | |||
| Sarah Underhill (1715-1761) | |||
| John Underhill (1718-1775) | |||
| Mary Underhill (1720-1788) | |||
| Frederick Underhill (1721-) | |||
| Nathaniel Underhill (1723-1784) | |||
| Bartholomew Underhill (1725-1786) | |||
| William Underhill (1727-1784) | 16 February 1727 Westchester County, New York, USA | 1784 Westchester County, New York, USA | Mary Dean (1728-1778) |
| Helena Underhill (1729-) | |||
| Glorianna Underhill (1731-1783) | |||
| Israel Underhill (1732-1806) | 10 September 1732 Westchester County, New York, United Kingdom | Williamsbridge, New York, United States | Abigail Lispenard (1739-1806) |
| Elizabeth Underhill (1735-1769) | |||
Siblings
| Name | Birth | Death | Joined with |
| Humphrey Underhill (1686-1705) | |||
| Thomas Underhill (1687-1762) | |||
| Nathaniel Underhill (1690-1775) | 11 August 1690 New Castle, Westchester County, New York, USA | 27 November 1775 Yorktown, Westchester County, New York, USA | Mary Hunt (1692-1775) |
| Benjamin Underhill (1694-) | |||
| Abraham Underhill (1697-1750) | |||
| Mary Underhill (1697-1765) | |||
| John Underhill (1700-1709) | |||
| Barton Underhill (1703-) | |||
| William Underhill (1707-1777) | |||
| Jacob Underhill (1710-1807) | |||