Hi Ryan, I tried to respond via Email as I wanted to address each paragraph, and it might get messy. However the Daemon demon struck so here it is...I have deleted Ryan's statements, since this post won't discriminate who said what.....
I would say the reference to Stanfield is in error - She was Elizabeth Posey Huffman Adair. There is indeed a headstone in Lawrenceville for This Robert Sidney Adair.
You did not specify where the reference to death in 1786 is. Perhaps it said "bef. 1786"
She also received a pension and payment for horses etc that Robert supplied during the war.
I believe there was only one Elizabeth Adair in the area at that time.My current opinion is that she had two children: Adam Huffman from her first marriage and Robert Sidney Adair from her second.I may be responsible for the story that perhaps George was also a son but there is no evidence of that and considerable that he wasn't - including her will where he was not named.
I think the Edd Adair in the 1810 is really Ed for Edward Adair. He may be a cousin, possibly son of John Adair.Elizabeth was apparently enumerated with son Robert in 1810 Pendleton SC.Robert is HOH. with two females, Probably wife Martha and mother Elizabeth. They are living next to sister Nancy and husband, Samuel Maloney who moved to Gwinnett with them in 1818.
In 1820 census, Elizabeth is shown living alone except for 12 slaves and one free Negro. I don't know where all these slaves came from as they only had one in 1810.
I probably posted the biography based on one drawn by a fellow jurist in Gwinett County. Please See - A Biography of Robert Sidney Adair The Writings of Richard D. Winn, Judge of the Inferior Court 1879 The complete biographical sketch is included in Volume I the History of Gwinnett County, Georgia 1813-1943, Copyright James C. Flanigan, printed 1943, by TYLER & COMPANY, Hapeville, GA.
Somewhere on GenForum I recall posting the rationale for the conclusion that Hezekiah Posey and Elizabeth were siblings.It is based on the Mordecai Millar [Mordica Miller]Rev. War Pension Application
Hope this has been helpful.....It was a lot clearer in the Email. Ed