Nancy, My 4th great grandmother was Amadilla Gleason Masters born 22 Sept. 1817 I believe that Amadilla's Parents are Jason Gleason and Melightly Packard. Working on proof. If Jason and Melightly are Amadilla's parents based on census records it is unlikly that John is a brother.
Have you considered Amasa Gleason as John's Father?
Other children that are a tentative connection as Amadilla's siblings are: Soloman W. b.1831 Alanson P. b.1834 Charlotteb.1830 Melvina Lydia 1822 Eunice
I do think that Eleanor Masters is John Masters half sister who married Amadilla. Maybe you have some connecting information? Sincerly Rhonda L. Johnson email@example.com