Your son would have to occupy the unit as his primary residence for at least one year. If he does not, a tenant can file an application against you under the presumption that he or she was evicted on the grounds of bad faith. As of September 1, 2021, a bad faith order from the LTB against the landlord may include: an order to pay the former tenant an amount of increased rent for up to 1 year, an amount of up to 12 months’ rent charged to the former tenant, an amount for reasonable out-of-pocket expenses, a maximum administrative fine of up to $35,000 which is the current jurisdiction of the Small Claims Court, and other penalties as deemed appropriate by the adjudicator.