Mary, I had read that John was a Scotchman. James McKittrick Adair wrote a letters reporting the death of his brother John in America. I tend to lean towards the theory that it may have been Dr. James McKittrick Adair (walking companion of the poet, Robbie Burns) who may have been a brother. Another brother may have been of the Robert Sidney Adair family, whom may have gone to GA. Dr. James McKittrick Adair returned to America in 1793, however, he appeared to travel extensively, and may have made earlier expeditions.From memory he was born mid-1700s.
Refer to nos. 8 and 9,(George Washington papers) and nos. 16, 17, 18 at :