According to my files, Flavien died in fall River on May 8, 1923. I don't know when Marie-Louise died.
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However, Flavien Ducharme is a part of the Tétreault dit Ducharme family. I suggest you contact Marcel Bouthillier, an expert on that family, at firstname.lastname@example.org. Maybe he will ba able to help.
BTW, do you know when and where Flavien and Marie-Louise were married ?