Hi Robert, I have not been able to make any connections with other Calhouns since posting my previous message. My uncle-in-law's oldest known Calhoun ancestor is James Allen Calhoun. He was born in October 1859 in Lumpkin Co., GA. His parents may be John Calhoun (b ~1840 in GA) and Jane Sophrenia Grizzle (b~1840 in GA). They were married 20 Dec 1857 in Lumpkin Co., GA. I have no other clues to go on. Does any of this match up with your line?