"Birth: ABT 1733 in of Mansfield, Tolland, Connecticut, USA
Death: BET 19 MAR AND 16 MAY 1812 in Batavia, Genesee, New York, USA
WILL dated March 19, 1812 in Batavia mentions wife Sarah; sons Lemuel, Isaac, Joseph and John; daughters Martha Wheaton and Sarah Eddy.
1790 census: VT, Orange, Randolph p3 23 1
1800 census: VT, Orange, Randolph p1 02201 01001
1810 census: NY, Genesee, Batavia p5 00001 0001"
This source identifies Isaac as the son of Sarah Fuller, and the father of John Newton and Lemuel Newton rather than their grandfather.
Apparently the will entered probate on 16 May 1812. No further information about this will is given in the citation; however the author (Mr. Steve Newton) has privately provided a scanned copy of the will. The will designates Isaac's "beloved wife Sarah" Newton as administrator of the estate. Attached to the copy of the will is a letter to son Lemuel Newton dated in 1813 stating that Sarah has passed away before she could discharge her duties as administrator and designating Lemuel as administrator of the estate.