1. Frances Lockett, daughter of Thomas Lockett. Perrin named in his will "to my be- loved son-in-law, Perrin Allday." 2. Susannah Allen Sublette, a widow, by whom he had issue...at least one son named Seth. 3. Ann Tankersley, a widow, 5 July 1805. She aged 95 and he 105. He outlived her.
The last two marriages were in Charlotte Co. VA.
I can't answer your other questions. The Johns were in every generation after the first surfaced in the late 1600's.John of Charlotte Co. was married to Mary but I don't know if they were one and the sameI have a copy of Thomas' will in Henrico ca. 1759. I have no info on other Thomas'.