the book: Prouty (Proute) genealogy Authors:Pope, Charles Henry, City of Publication:Boston, Mass. Publisher:C.H. Pope, Murray and Emery Date:1910 Page Count:247
says James Prouty (Jacob, Jacob, Isaac, Richard) b.Westmoreland, Nh c1786 married 1st Lavinia (--?--), married 2nd at Sutton in 1865 Ruth (Jones) Lincoln.James died in Sutton 1867.Next of kin from probate were (all children of deceased):James W. Prouty of Beloit, Wis; Calvin W. of Canaan, Vt; Walter Prouty of unknown; Lydia M. Came of Worcester; Zilpha Prentice of Fitzwilliam, NH; Amanda R. Wood of Nortbridge; Ruth Drury of Titusville, PA; Lavinia Walrodt of Chester; Laura Luther of Ft Wayne, IN; Hannah Pope of Cookshire, C.E.
I think this fits with your info because I see a Betsey Prouty in Canaan, VT on the 1870 census.I didn't see anything on Alva Prouty.What time period & location do you have for him?