The genealogy database is located on ROOTSWEB and contains over 24300 individuals. Note that there are many different views which you can access, including family, descendant and pedigree views. You can move around in the database via searching the index or clicking on different names on each screen. Database links throughout the site are denoted by bright blue buttons.
The focus of the database is descendants of Francois Sirois dit Duplessis including and especially descendants of his grandson and my fourth great grandfather Joseph Duplessis.
Some suggested starting points: