Dave: I'm just getting back to tracing my ancestors and have somewhat the same question you do. Didyou find an answer? The way I figure it is that there were two Abrahams. One was born in 1760 and the other 1761- probably cousins. My Abraham was born May 30, 1761. His father was Abrahham , born 1728. That Abraham's father was Teunis , born 1697. His father was Gerret, born 1662 in Holland.Gerret's father was Lambertse Huybertsen, born about 1638 in Holland.
The Abraham, 1761, was my great, great, great, great grandfather. His daughter, Christina, was my grand mother's, Jeanette Woolsey, grandmother. They were all from the Ulster County of NY area.
If you have any information to share I would love to have it.