re:" Both girls were named Marie, if they had another given name, it did not show up in the Canadian records."
for Marie Langlois
Just noting this has roots in Catholicism. It is in honor of the Virgin Mary. "Marie" is linked to Mary, and many were "Marie" if a girl, or "Joseph" if a boy, and then it was followed with two given names, which people would be known by, even though legally you would be Marie so and so or Joseph so and so and documents would reflect. So, as an example I would have been named Marie Karrie Amelia, and my sisters would have been Marie Sister One, Marie Sister Two, etc. I hope this makes sense. I'm not an "expert" by any means, but do have recent ancestry from Quebec so encounter this frequently.