"Rent to Own" a Home is in essence an Installment Contract to Make a Deed. Because it involves the purchase of land, it MUST be in writing to be enforceable by you. Without a written contract you have, at best, an oral month to month lease. Either you, or your landlord can terminate your oral lease with 30 days notice. Since it appears your landlord is intent on selling the property, I'd be looking for another place to live; unless you are willing (and able) to obtain financing and purchase the home outright.
Under no circumstances do you rent a property without it being in writing. A judge has no way to know the truth of what was agreed to in the agreement. Get it in writing or move to another place with a written lease. You are not going to get a judge to believe you agreed to make the biggest purchase you make in your life, and you have nothing in writing.
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