According to the private journal of Elder Peleg Burroughs of Tiverton, a Minister of the Gospel, "on the 8th day of September A. D. 1780 -- Preached at B. Hambly's upon Psalm 107:31 (O that men would praise xc) married John Manchester to M.F. and stayed all night at Bro. Davenports."
Benjamin Hambly's wife was Elizabeth Fish, probably related to Mary (needs more research).
In the 1850 Federal Census, John & Betsey, ages 59 & 57, are living at Tiverton, RI. Five children are in the household with them: Amanda, Frederick, Albert, John A., & William W.