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This is the reply I just posted to your same question at ancestry.com's Gravel message board:
Actually, Delphine spent much of her life using the name Josephine.
Delphine-Josephine Aubin married Pierre Gravel, son of Louis Gravel and Genevieve Coutu, at St. Peter Catholic Church in St. Joseph, Huron County, Ontario on 13 October 1879. Source: parish records of St. Peter Catholic Church, St. Joseph [then known as Drysdale or French Settlement], Huron County, Ontario; unnumbered volume, page 20, unnumbered marriage record in 1879; available on LDS FHL microfilm #1310854 (gives name as Josephine; gives parents' names as Francois-Xavier and [unreadable but appears to be Armentis] Mousseau).