Justin
Email W. H. Rainey at whrainey@yahoo.com, he also publishes Rainey Times. He has been doing this for many years.
Death Certificates will give you your grandfather's parents. Courthouses, is a wonderful source of information. The Washington Library in Bibb county is a really good place to research. They have a webb site for genealogy. Mr. Rocker who formally worked in the Archives in Atlanta is now at Washington Library.