Thank you for your reply. Here is the info I've found.
Laurant Trudeau, born 11 Mar 1685 in Longueuil, Quebec, married Marie Anne Billeron-Lafatique on 25 Sept 1719. Their son, Joseph Trudeau, born 11 Sept 1729, married Marie Judith Renaud-Blanchard on 5 Mar 1753 in the parish of L'Assomption, Quebec. Their son, Joseph trudeau, born in 1756 married Marie Hyppolite Durrand on 31 May 1785.
I can also bring you up to the present, if you are interested. I'm sure this is the same family and I'm glad I found your posting.