I forget if I responded to you already. I am also descended from John and Polly through Benjamin Mattingly. Unfortunately we have the same dead end. Are you aware of the apparent relationship to Archbishop Fenwick of Boston? It is believed that they were cousins, probably 1st cousins. That would apparently establish who Polly's grandparents were at least. Let me know and we can share information. I'd be interested in information on Peter's descendants, and I would be happy to provide info on Benjamin's if you are interested. Email me at MTMCDEA@AOL.COM if you are interested in sharing information. Chris H.