Carol.
I'm Researching my 4th GGF Archer St Clair of Amelia County Virginia. From what I have found Archer indeed married Sally P. Gibbs. And had a daughter Mary E. St Clair. So I guess Miles Archer Tatum would be my 1st Cousin 4 times removed... Or how ever you say it...
I'm stuck at Archer on the St Clair line. And am having trouble bridging a possible connection to a Thomas Webster (b:1690) and Prudence Gibbs. They were in Henrico county Virginia.
Hope you get this. Might have some more info on the Tatums for you.
LM