Don't have any info about his parents, but there was a Thomas Addis in Franklin Twp., Fayette County PA in the 1820's and 1830's, according to tax records. There was also a Thomas Addis who was briefly a minister (Methodist, I think) in that area around that time. Not sure if it was the same person, but seems likely. There were a number of Addises in Fayette County - some of whom moved to Ohio in the early 1800s. Most were children of Jonathan Addis, who came from Bucks County - but I know of no record that says he had a son Thomas.