If you're considered a dependent student, then you have to give your parents' financial information.
When you go through the forms, it asks about income reported on Canadian income tax, and then income not reported on Canadian income tax. So you'd put zero for your father in the first box, and then whatever he earned in the second box.
There might be more to it than that (such as supporting documentation), and as ashleighp said, you should talk to the SFAS office to make sure you do everything properly. It's not something you want to guess at and screw up