Mailloux Family Genealogy Forum
You might look up a book by Denissen, entitled "French Famlies of the Detroit River Region". It is published by the Detroit Society for Genealogical Research. It provides a pretty exhaustive storehouse of genalogical data on families such as the Mailloux's and Villiers. It kicks in about 1850 to 1900 or so for most families, and then traces people back often all the way to France. The author though did anglicize all the first names so you get situations such as my great-grandmother who is called Arseline by the family but Ursala by Denissen.
Aother resource, harder to find but fun to read, is a book published about 1960 entitled "The Windsor Border Region". In it you will find original census data for this area in which your probable ancestor Joseph Mailloux appears, text of documents and petitions to the government which almost certainly were signed by some of your ancestors and a fairly readable account of the region's history. The settlement on the Canadian side of the Detroit River was orginally a Jesuit Mission at Assomption to the Hurons started in about 1730 or so. Then in about 1750, the French government allowed some French Canadians to settle near the mission. It was renamed "Sandwich" in the 1790's when some loyalists settled there. This actually is the first European settlment in Ontario.