Came across your query regarding Pierre and a line of his descendancy. However, there seems to be an error.
I, too, share much of this same lineage. But at Joseph DESCHENES and Marie-Louise GRENIER, things break up a bit.
Joseph and Marie-Louise married on 11 Aug 1816 in Yamachiche, QC. From 1818 to 1833, they had 9 children. I am descended from their second son, Augustin-Louis. Marie-Louise then died. On 11 Aug 1840, Joseph married Mary MARKS. In 1846, they had a son, John.
This Joseph seems to have never lived in Ontario. Perhaps the one you found is a different one.