HI, I am the forth ggrandaughter of these folk as well. Have you even been able to find a marriage record that would record that Thomas was her father? There is a lot of dispute over whether Rachel was a Hagan; a Wilcoxson; or a Tate. Apparently there is a lot of confusion on Ancestry regarding this. I have the same info as you do, but no direct proof.
Thanks,
surely a cousin here!
Lynn