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Francois Langevin is the son of Louis Langevin (1715-1747) and Marie-Therese Desmaris (1719-?).
Francois Langevin's wife is Marie-Barbe Tetreau dit Ducharme. They were married 10 NOV 1766 in Vercheres, Quebec, Canada. They had one known child named Marie-Amable Langevin.