I, too, have been trying to document one Roger Williams (b. ? Eng. or VA d. (or will proved?) 2 May 1677 VA). He was supposedly the son of Sydrach Williams & Mrs. Anne Pinner, and grandson of James Williams & Alice Pemberton. The parents and grandparents may have remained in England and Roger was the immigrant.
Roger may have married 2nd to one Jane/Joan Frith, dau of Nathaniel Frith & Joan Parsons.
Among the supposed children of this Roger Williams are one Ruth Williams who married John Canterbury and Joan Williams who married Cornelius Kincheloe.
I have just recently started to work on these folks and have not entered a profile for any of them into WikiTree as I don't have any acceptable documentation for them. In fact, I don't even know that the names are correct, so it might be quite some time before I might be comfortable listing them in WikiTree.
I would venture a bet that there are others on here who have more information on this Roger Williams and his family connections, with good sources for them. Such other researchers would be more appropriately the ones to enter profiles for the above people into Wiki Tree.