Here’s a great website for finding the land where your ancestors lived in Upper Canada (Ontario). The list will tell you the land your family owned by lot and concession number in a specific year. It’s organized by township and surnames are alphabetical so if you know where your family lived it will be easy to find. Otherwise you’ll have the fun of going through each township in the county or possibly the entire list to find your family.
I recommend you look at land records, you never know what you’ll find. This database can be a beginning to find those records.
Upper Canada Land Registry Index