His parents were married 16 June 1846 at Saint-Bernard-de-Lacolle, Les Jardins-de-Napierville, Québec, Canada.
Louis' parents were Ignace Blain and Ursule Roy. Her name is shown as Madeleine Bourdeau, daughter of Laurent Bourdeau and Marie Anne Menard.
The original marriage record can be seen in the top right of the image at: https://familysearch.org/pal:/MM9.3.1/T ... 00-4241-61
I did see Louis' mother cited as Ursule Poirier in a different research tool but I have no validation of that. Obvioulsy, there could be two Ignace Blain men involved.