Real Estate Law
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Of course he can force you to leave at any time because you do not have anything in writing such as a lease which would permit you to stay for a certain term. It could even be a long-term lease for say 5 to 10 years, and sister would have nothing to say about it. You would be bound to pay the rent to his guardian if a Guardian were appointed, but that's the worst case scenario. Therefore, be sure that your lease does not contain obligations that you cannot meet financially.
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