Student loans, there are more than just Osap, apply for more, and have the child work during the school year. Lots of Universities and Colleges also offer part-time jobs.
Renting rather than dorms also means saving a lot of money, on average student rent is around $500, x 8 months would be $4000 rather than the expensive $13,000 dormitory.
Cooking also saves money, a student's average groceries would be $40 per week? (Depending on how good they are at this, there's lots of youtube tutorials for students meal-prep and grocery shopping).
Try to get online versions of textbooks (this can save a LOT)
If the child works, then they can pay their own living expenses, and it would be around $13000 to $14000 for the school year (if they don't work, then around $16000)
(A student can also earn around $3000-$8000 during the summer, depending on their job)