I believe my 2nd great-grandfather, John R. Petty, was Benjamin's father. It's a complicated story but John R.'s first wife died in KY in 1876 and most of their younger children went to GA to live with his wife's sister. John R. moved to Whitfield County, GA where his father and a few sisters lived. He married Mary Bohannan there in 1878. Mary later married a William Hall. I believe her current name instead of her maiden name was listed on Benjamin's death certificate.
Feel free to contact me directly at firstname.lastname@example.org