I can't help on the ancestry of John or Susan's William but I note your William Archer married Mary Botts. Do you have the parents of Mary? I do know that William Botts of VA married Sophia Fairfax. She was the daughter of Captain Henry Fairfax and this relates to the Fairfax family of VA and the Calverts which may indicate a tie to your Calverts also. There is a significant migration of Calverts to SC, especially related to Burr Calvert Alias Harrison Alias Harris. Burr was the son of John Calvert who m 3 x my opinion, Elizabeth and Jane Harrison, and another, Mary Goslin or Margaret Robinson perhaps. There were adjoining migrations of Calverts to SC as well but my point in this is to direct the query to knowledge of or any suspicion of having a VA connection. If Mary Botts is a known factor, it may behoove you to look at Virginia Calverts.