My father has self earned property, in this land I have constructed house by taking housing loan. The loan has been taken as coapplicant between myself & my father. Loan still has outstaning balance & it is not yet cleared. But now my father is willing to transfer or write a will in favour of my sister. How I can go further if the land has been transferred to my sister or will has been written in favour of my sister. Only one sister Iahve & don't have any brothersw