Uncle took land by fraud now asking to compromise what should we do

My paternal uncle had sold by forgery a land that was fathers property (after my fathers death) . Just before the death of my grandmother, he got the flat transferred to himself on the will from my grandmother. Now he is insisting that we take the forgery case back and that he would then transfer the flat to our name. We on the other hand are asking him to first transfer the flat in our name after which we would take the case back. The flat is the one where we are residing in from 30 years and was bought by my grandfather. please suggest the best way for compromise in such trust deficit.