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Have you provided them with a notice of eviction?
Are they willing to move out?
It is a shared accommodation? Are you living in the house as well? If so, do they share a kitchen or bathroom with you?
Then they have no right to stay and must move out within 10 days of your giving the a notice of eviction.
If they do not then you have to apply to the Landlord Tenant Board for an order for eviction.