I am trying to find out which this Caleb was. My wife is descended from him through Synthia (name spelled Sinthy in Caleb's will) who married George Babb in Hopkins County, KY in 1830. They subsequently moved, eventually to Pope County, IL. Synthia's brother, Soloman, married Adah Babb, George's sister. I have the information from The Lytton Study Group on the Letton family. I have some previous correspondence from several years ago with some other researchers, but this guy still seems to evade detection.
I think the last message that I saw from Caroline DeBiasi regarding this Caleb, she thought he was a son of Michael, but admitted that she could not prove it. Others show him as a son of John Richard.