Start with Gabriel Dumont's profile https://www.wikitree.com/wiki/Dumont-427 I see no evidence of he and wife Madeleine having children. However if you look at his siblings they all have children so you might trace those families to a point where your connection might fit. But a DNA match with a descendant of those families will likely be needed and there is a list of these people on the right side of the profile page.
