Share in grandfather's property

My Grandfather got allotment of house after Partition from Government in 1955 per conveyance deed. My Father and my uncle (Chachi Ji) distributed the house further per Partition Deed (Taksimnalma). We are two siblings/brothers. My Father per VERBAL Agreement gave other Plot in his(My Father’s) name to my brother (As his final share in property). Later, he did Will (Vasiyat) in 1988 where he notified that my brother has taken his share in form of that plot and rest should be given to my other son (Myself). Now, my elder brother is deceased and survived by her widow and 3 children. My Father still hasn’t done registry in his name and has conveyance deed in my GrandFather’s name as well as Partition Deed (Taksimnalma) with him. 1. Can my father sell that house 2. Can he get that house registered in my name 3. Do my brother’s widow or children still have share/claim on this house. Please help.