I'm sure my original dates for Catherine and Mary came from Fran Greene who has apparently vanished from the Genealogy world. Someone in the Garrell family also gave me a similar date for Catherine a couple of years ago.
I have a good deal of info on Hardy and his family that came from a relative in Georgia, I think. And I think you're right, he went to Alabama rather than Mississippi. He, his wife and several children died at an early age from whatever sickness was lurking at the time.
I've seen two dates for Frederick, Jr. One being 1790/1791 and the other being 1814. There were too many Fredericks. It would be wonderful to put the puzzle together. Even more wonderful would be to find the Father of Frederick Sr.