Is my son who lives at home, born in April 1999 but attended university our dependant? we didn't help financially for university

[TurboTaxKim]

Only if you are claiming any credits from your son, such as tuition transfers, do you need to add him as a dependant to get the credits for him.

He should file his own tax return regardless so he can receive the GST/HST and any Provincial Tax Credits he may be eligible for.