I am Xavier's (His real name is François-Xavier's great-granddaughter.
I'll share what I know for now.
Joseph was born on Oct. 18, 1838 His wife Catharine was born on Jan. 6, 1947
My great grand-dad was born on 15 Dec 1871 and he did marry Joséphine Mainville.
My grand-mother, Alice Desjardins married Georges Nadon on August 10, 1940 and they lived in St-Benoît all their lives.They had 7 children, Marcel, Paul-André, Lucille, Gilles, Jean-Yves, Michel and Gilbert.
Her brother Joseph married Thérèse Cardinal on 3 Sep 1949.
I'll try to dig in...I'm also trying to locate Catharine Walsh or Welsh (Both spellings are used in the Book of marriages for St-Benoît and St-Placide). Rosa Desjardins was born on 30 Mar 1887 Napoléon Desjardins was born on 18 Aug 1882 Alfred Desjardins was born on 2 Nov 1883 Bridget Anne was nicknamed Annie.