Jane Fletcher Fiske and John Redfern have John's ancestry as William & Mary, then Thomas & Margaret. Alden C. & Rita C. Manchester have his ancestry as John & Marie, then Thomas & Margaret.
John was executor of his father's will.
Tiverton Deed Book 1 has a deed dated 27 Jan 1754, naming John Manchester of Tiverton and his son Isaac of Tiverton. Does this pertain to this particular John Manchester? See elsewhere on this family tree, John Manchester born c1688.