I’ve been researching Abbotts/Abbetts in middle GA for a while now. Not much luck in finding my own ancestors, but I noted down the following a few years ago from “A History of Jasper County, Georgia”:
p. 112 - “Dr. Milton Antony studied medicine in Philadelphia …..in 1809 he married Nancy Godin (?) in Wilkes County home of mentor Dr. Joel Abbott (Later the Robert Toombs home).”
Maybe your Abbotts were physicians for several generations. Do you know if the Medical College of Georgia keeps student information going back to the early 1800s? (Dr. Milton Antony was a founder.) Your Littleton Berry would have studied there, most likely, assuming he was born in Georgia.