Francis, Came upon your post just today. In your lineage, Omer Sevigny married Elise Sevigny on 25 Jan 1887. They were first cousins,correct? If I have it written down correctly, Omer's father, Francois-Xavier, and Elise's father Isaie were brothers; both sons of Antoine Sevigny and Angelique Aubin.
PS: My husband is descended from another child of Antoine and Angelique.