Your George ABNEY (Sgt.-Am.Rev.) was a son of Dannett ABNEY and his wife, Cassandra (ABNEY?). Two deeds of 20 Dec 1797 show this: 1. Dannett ABNEY to Samuel ABNEY, my son 2. Dannett ABNEY to George ABNEY land adjoining his brother, Samuel ABNEY.
Dannett ABNEY was devised land in his father, George ABNEY's will written 13 Oct 1765 & prob.16 Oct 1766.
George ABNEY (who m. Unity) was a son of Dannett Abney Sr. of Leicester, England & Mary (LEE?).
I have theorized that Dannett's wife was his 1st cousin, Cassandra ABNEY, d/o Dr. Abraham ABNEY & Cassandra (MEREDITH?).