Hello, I have recently begun adding my wife's family genoelogy to ancestry.com and I saw this post. Her mother's family tree follows back through surnames Sylvester Buchanan Thomas who married Sarah Elizabeth Kellems, daughter of Isaac Riley Kellems and Mary Jane Alvey. Issac Riley Kellems was the son of Charles Isaac Kellems and Elizabeth Leftrige. I show Charles Isaac's birthplace to be KY, but don't have a date for birth or death. His wife died in Perry County, IN, which is in line with his children and where my wife's mother's side (Thomas) family resided.
Any information you can share would be appreciated to let me know if your Charles Isaac Kellems is the same.