When researching my Boudreau line, I only learned about the Darche line from posting on the St. Anne List. Some wonderful people on the list provived me with information that I posted in my query, so I can't directly solve your mystery. However, I was thinking, if you already haven't done so, you could also post on the St. Anne List. Maybe, someone on the list can help you.ILSTANNE-L@rootsweb.com
Good luck in your search........