Laurier Quebec is one of the largest malls in Canada. The trick is to park in the garage and run in for dear life from the cold.
The food court is really huge and gives some great options to hide from your wife and drink coffee while she shops. It also has a playground so you can not only drink your coffee but entertain your children at the same time.
The mall also physically connects to Place Sainte-Foy so you can potentially lose your family for days.