Andries DeWitt (eldest son of the above Tjerck Claessen DeWitt) was born in New York City in 1757 [sic] and in 1682 he married Jannetje Egbertson. For some years he lived at Marbletown Ulster County on a farm given him by his father but removed to Kingston previous to 1748.

In July 1710 he was killed by the fall of two sleepers (beams) upon him. He was known as Captain Andries DeWitt and is buried in the Kingston churchyard. He had 13 children the 9th being Egbert DeWitt born March 18, 1699, married Mary Nottingham. He settled Napanoch in the town of Wawarsing, Ulster County. His daughter Mary married General James Clinton, and became the mother of DeWitt Clinton.

The eldest child of the above Egbert DeWitt was Andries DeWitt (baptized March 3, 1728 died February 7, 1795.) He was baptized October 15, 1727 and married Jannetje Vernooy. He was a physician and practiced his profession in his native county for over half a century. He died in New Paltz in 1799.

Surveyor General Simeon DeWitt was one of the sons of Dr. Andre DeWitt.

Jacob Rutzen DeWitt was the second child of Ebert DeWitt and was a brother of Dr. Andries DeWitt and an uncle of Simeon DeWitt. J.R.D. removed to Sullivan County (now Orange County where he purchased land on the Navesink River. Was a captain of a militia company (called DeWitt's Rangers) during the Revolution. Jacob Rutzen DeWitt's oldest son was one of the surveyors to establish the boundary line between New York and Pennsylvania and was county judge and surrogate of Herkimer and Onondaga counties 1791–99.

One of Jacob Rutzen DeWitt's daughters Rachel married Colonel Robert Burnett of Revolutionary fame.

Thomas DeWitt was a Major in Ganesvoort's regiment in the Revolution and was engaged in the defense of Fort Stanwix when attacked by St. Ledger. In 1779 Major Thomas DeWitt accompanied General Sullivan's successful expedition against the Indians. His oldest son Jacob H. DeWitt was adjutant in the War of 1812 and afterwards commission[ed] Colonel. He was MC and State Senator. Thomas was uncle to General Simeon DeWitt and his son JH was a cousin. Thomas lived first in Marbletown and afterwards at Kingston where he died in 1809.

Genealogy of Simeon DeWitt.