>single dad rents out another room (not mine) for extra income

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>single dad rents out another room (not mine) for extra income
>tenant is normal and lives like a regular adult
>go off to college
>tenant uses dads laundry supplies, cleaning supplies, and toiletries
>tenant never goes grocery shopping and leeches off whatever my dad cooks for dinner
>dad is now cooking for two people instead of one

how do i show my father that he's at a net loss from this? the guy tries to act like a close friend instead of a tenant and i'm tired of it. when i came home from college and saw what he was doing, i immediately clashed with him and he got in my face as if it was his house.