Hi, sorry didn't read this until now. I believe that Joseph was married to Sara Petit-Couteau and she was my dad Laurence Boudreau's aunt. My dad's mother was her sister and her name was Veronique Laboucane. Her mom was a Petit-Couteau.
As for the Deschenau's, Sara and Joseph had Henry, Wilfred, Lucy, Mary, and another son but I can't remember his name. There is a Deschenau that lives in Hinton with a lot of pictures of their family but I am truly sorry, I can't remember his name,,,,maybe Sonny.
I don't know anything about Pierre...Hope this helps.