Hi KL,
Could your ancestor John Featherly/Fetterly be a son of Philip Fetterly (c.172-c.1800) married to Anna Margaretha Schumann? They had several children in the Berne, NY, area between 1749-1775. You can contact me at the email above for more info, or search on Philip Fetterly (born around 1725), lived in NY on ancestry.