What are my opitions with this property?

[David Lee]

I found a property that a woman purchased for her sister to help take care of her mother. Her only stipulation was after her mother died was to start paying the loan off. She has decided to move and The one who owns the house just wants to sell it. All she wants out of the property is someone to make the payments or buy it for the payoff. What type of options do I have for just taking over the loan?