My g-grandfather Pierre Ricard (1854-1928) was the son of Joseph (or Jean) Athanase and Dell Marguerite Trudeau … so the brother of your g-grandfather Athanase. Pierre was born in St. Michel, Napierville, Quebec – although I’ve seen/heard family references to Coaticook. In late 1800s, he and much of the family migrated to Toledo, Ohio area. I show Domitille Isabelle married on April 1, 1863 to Sollem Athanase Ricard (Oct. 28, 1838-Sept. 1907), with children listed as Arthur Ricard, Mrs. J.E. McGinnis and Mrs. E. Gilchrist Ricard.
Hope that's helpful and welcome further exchanges.