Can I evict my cousin from the building?
Not sure what the heck is going on here. First do you have 100% legal Title to the property? It almost sounds like there is a property ownership disagreement. Does your cousin feel the property should be part his. So much unknown here. It is not clear if you and your cousin even have a Landlord / Tenant relationship. It sounds more like he is an invited guest or sqatter that you now which to leave. At the end of the day it is up to a judge to decide. I would suggest to try and work out a win win if possible. Offer to buy out your cousin. But if this is a fight over property ownership then this could be a big battle.