Just trying to clarify something - your first Phelonise was b. 1851 and md. in 1871. When you say "Phelonise 'Fanny' later appears in Worcester, MA when she married Napoleon GRENIER (born 17 Apr 1871) on 12 Aug 1918 at Notre Dames des Canadians Church, Worcester, MA" don't you mean that her DAUGHTER also named Phelonise "Fanny" married Napoléon ?. After all, the first Phelonise (mother) would have been 67 years old by then, and Napoléon Grenier would have been 47.
Was there a daughter Phelonise "Fanny" as well ? Was she maybe the youngest of the 5 children, so maybe ca 30 when she married Napoléon ?