The George Gamble you mention was born in SC but his father is Robert John Gamble Sr who died in 1817 in Jefferson CO, GA.RJ Gamble migrated to GA sometime after living in SC.RJ Gamble Sr was married twice, first to Margaret McGill Lawson, then to Unknown.
Children of Robert John Gamble Sr and Margaret Lawson:
--George born SC, married to Margaret or "Grissy"...may have been short for Gracy. George died in 1822 in Henry CO, AL.One of the original first settlers.
--Hugh T. born 1787 (was in Henry CO briefly before moving to TX)
--Roger Lawson Gamble m. to Mary Sterritt born abt 1787 died 1847
--Andrew Gamble (1788-1843) m. to Alice Lawson (they were in Henry CO)
--Hannah Gamble m. M. Patterson
--Robert John Gamble, Jr born 1790 m Rachel Lowery and then Violet Lawson (my line)
--Mary Gamble m. James Bothwell, then Ebenezer Bothwell.
Robert John Gamble Sr's children with second wife (unknown)
The reason we know George is the brother of Andrew is that when his wife died, their children were left in the care of their aunt, Alice Lawson Gamble.Hope this helps.