The only sibling of Joseph I found is Marie-Caroline Gelinas born October 10, 1841 in Joliette, Quebec. I did find Claude's parents who are Noel Gelinas & Marguerite Robillard-Lambert. The parents of Flavie are Jean-Baptiste Bonin & Madeleine Boucher.
If you need any more help, let me know. I have the Gelinas lineage back to the 1500's.