Some sources have Edward Adair, b.17 Feb 1789, son of John Adair & Nancy Lightfoot. Am not sure when John Adair married Jane Kilgore.
There appears to be another Edward Adair whose land records are in the S.C. Archives. The most interesting one appears to be: 1799 /07 /15Jacob Faust, 488 acres Cane Creek, Edward Adair, junior ???? date 11 May 1798.
Edward Adair, junior, may have been an adult (?) in 1798, so he would not have been the son of John Adair & Nancy Lightfoot as he was too young then ..... unless his father was buying land in his name ?
If it was Edward Adair, jnr, who married the elusive Margaret in 1791 in Philadelphia, then his age may fall more in line with having the above land in 1798 ?
Other land transactions for Edward Adair in SC Archives (I looked up SC Archives becaus LeRoy Hammond was at North Augusta in Edgefield Co South Carolina ?) were: 1796/01/04.Will of Ann Ellis Hathorn, 96 District.
1796/07/25 Geddes, Henry versus Edward Adair, judgement roll.