Hello S. Gortmaker, You have had a lot of responses but none really answered you query at least here on the genforum.Maybe someone did by email.
Marie Sophie Potvin is the daughter of Joseph Potvin and Victoire Brule.Here is her baptismal entry: Notre Dame parish records, 1848-1855, Ottawa, Ontario on LDS microfilm 1301762 Sophie Potvin, daughter of Joseph Potvin and Victoire Brule born January 19, 1848; baptism on January 30, 1848 with Thomas Brule and Angelique Brunet as sponsors.
I do not know when or where she married Joseph-Janvier Demers but I have the date as around 1864. Here are the baptismals for the children I found in the following source: L'Ange Gardien, Angers, Qc parish records (1864-1900)S.G.O. by Marthe Delisle 1987 Octave b. 12/2/1865 bap. 1/7/1866 Zothique Routhier, Victoire Potevin Joseph b. bet 1866-1869 might be the George J. buried in the St. Alphonsus Cemetery, Tupper Lake, NY (b. 1868) Victorine b. 1/3/1870 bap. 1/13/1870 Pierre Proulx, Victoire Laframboise Marie Virginie b. 2/24/1872 bap. 3/3/1872 Antoine Trudel, Rosalie Potvin (aunt-wife) Marie-Louise b. 4/5/1874 bap. 4/8/1874 Bruno Moncion, Georgina Demers Leon b. 1/24/1876 bap. 1/27/1876 Vital Demers, Victoire Brule (grandmom) Emma Lucie b. 2/17/1879 bap. 3/2/1879 Francois Duval, Rose Anna Dehire Thomas b. 8/28/1881 bap. 9/2/1881 Benoni Beauchamp, Marie Brule Thomas b. 10/1/1884 bap. 10/5/1884 Joseph Demers, Victorine Demers (brother and sister to the child)
From St. Alphonsus Cemetery, Tupper Lake I found Leon married to Jennie and buried Joseph-Janvier and Sophie along with the second Thomas. George J.could be Joseph-Georgebut I am still looking.
You have 14 children for this couple.I am willing to share the rest of what I have on the siblings of Sophie Potvin and her parents etc for any help you wish to be in filling in the rest of the children.
Look forward to hearing from you, Sue Herbert firstname.lastname@example.org
PS.The Joseph Potvin and Emilie Legault Deslauriers info you were sent by Florence Houle is not quite right. That Joseph is a brother to Sophie not her father and some of the kids dates are different than what I have.