I am descended from Henry and Mary D Groat. I have his parents as William Groat (ca 1771-1817) and Lydia Huntington (ca 1771 - 1826 as Lydia -- Mrs. Samuel-- Munger).
The problem is that we cannot find a firm birth or death date for either William or Lydia. We think William was born in NY or Ct and moved to Ontario as a United Empire Loyalist. They may have been married about 1785 in Quebec or later, or possibly in NY or CT. First child was Preston in 1803.
We have this obit for their son Standish that fills in lots of blanks:
Christian messenger, Feb.1873-Dec. 1873, Vol.9. Obituary from mrperison from ancestry. May 2010
Groat , Standish - Died in Dorchester, 19 March last, in 67th year of his age. Born 4 May
1805, Twp of Sutton, Missisquoi, Quebec. Son of Wm and Lydia Groat. At age of 5 moved to
Whitby Ont.. 1813 his father died, left mother with 5 children. Widow for several years, then
married Samuel Munger, died with in a few years. At age 21 married Lydia , daughter of
Randell and Keziah Marsh. In 1831 moved to rear of Township. In 1844 moved to Dorchster,
wife died, remarried - Catherine York, daughter of Wm and Elizabeth York. Standish had 12
children , 10 by his first wife , 2 by second. Most of them reached maturity