Jecha, I have info to share with you. I have also traced the ancestors of Joseph Jean "Petit" Bourgeois and Marie Amable Guyon/Lemoine all the way back. My research was through Louis Brousseau, brother of Philomene. I have very little on Philomene except for her marriage to George Mercier in Chester, MA. Send me your E-mail and I will send you what I have. Thanks for the info on the 1870 census I had not found it until your post.