I checked on the Richard Sparrow b. 16 July 1727 Eastham, MA d. abt 1789 m. Deborah Howland b. 25 Oct 1739 Barnstable Co MA. Their son John b. 12 July 1765.You said that the Hungerfords were not in the area long. Does this fit in with what you know? I think the John Sparrow and Apphia Tracy seems more likely.I know the Hungerfords were there at that time.What do you think?