I currently live with my sister in our father's house. A few years ago, we made an informal deal where I would pay $500 a week to cover mortgage repayments (as well are rates, etc.), and once the mortgage was paid, he would transfer the property from him to me. I receive all the council mail care of and cover all costs. Just recently, I have found out that my father has signed a transfer form to give the property to my sister. I don't know why because my sister knew about the deal, but all she has paid for on the house been some minor renovations. What are my rights on this under property law? Do I have any options for pursuing ownership of the property if something happens to my father?