I am not related to any of these persons, however having French-Canadian ancestry on my maternal side, I found a query on the New York State GenForum intriguing and attempted to find some information regarding the ancestral families mentioned.
Here's what I discovered about the PAPINEAU family at the LDS Church website and in particular the 1881 Canadian Census
The following PAPINEAUs were listed at the Hotel owned by Charles LARIN, M,male, French, 54, Quebec, hotel keeper, RCath.There were many other persons listed as well for this particular enumeration but I only include the PAPINEAUs
Denis PAPINEAU, W, male, French, 28, Quebec, agent, RCath Hortense PAPINEAU, female, French, 3, Quebec, RCath Jules PAPINEAU, male, French, 6, Quebec, RCath as you can see Denis was a widower with 2 small children including your Hortense.
The census documentation follows: Census Place: Ste-Anne Ward, Montreal, Montreal, Quebec FH Library film: 1375853 NA Film # C-13217 District:90 sub-district: A Division: 10Page #:5 Family #: 29