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I am purchasing a 2 family home from my grandparents in New York state. They have no written lease with the other tenant, which would not affect me anyways. My sister and her family are going to need the other apartment in October, I told her yesterday June 19 that circumstances had changed and I was giving her 3 months notice, vs letting her know after closing when she would have less time. My grandparents are also aware and ok with this change. She has become extremely hostile and informed us she isn't leaving. What are my rights? I can only find tenant rights online.