He married Gertrude Schenck (1753–1794), the daughter of Helena Magdalena Van Liew and Hendrick (Henry) Joahnnes Schenck. Together, they had five children: • General
John Frelinghuysen (1776–1833) • Maria Frelinghuysen (1778–1832) •
Theodore Frelinghuysen (1787–1862), a lawyer and New Jersey politician •
Frederick Frelinghuysen (1788–1820) • Catharine Frelinghuysen (1790-1865) After his first wife Gertrude's death in 1794, Frederick Sr. married Ann Yard (1764–1839). Frelinghuysen died in
Millstone, New Jersey, on April 13, 1804, his 51st birthday, and was buried at the
Weston Burying Ground on the border of
Manville, New Jersey and
Bound Brook, New Jersey. His tombstone reads as follows:
Descendants Among his other descendants are
Frederick Theodore Frelinghuysen (1817–1885), U.S. Senator and
Secretary of State;
Joseph Sherman Frelinghuysen (1869–1948) US Senator from New Jersey;
Peter Frelinghuysen, Jr. (1916–2011) New Jersey Congressman; and
Rodney Frelinghuysen (born 1946) New Jersey Congressman. ==References==