Batwara suite vs oral distribuition between grandfather

My grand father(A) had 3 brothers(B,C & D). A,B,C & D had 1,1,4 & 5 sons respectively. They had divided properties orally.One grandfather(C) had made all land of his name in survey.When my father knew this facts, he had gone before the court in 1968. Then court had given the order to mutual understanding distribution (Sulahnama). They agreed and made a sulahnam.In that, my father had got Degree(Certificate) but fail to pay stamp fee due to high fee and other parties pressure. All of them had made building according to oral distribution or degree or both. My father(A)is getting more in a plot where B has less. B said we will follow oral distribution means 1/4 th to all. Meanwhile My father had exchanged one plot to uncle(D) in the year of 1970 according to khatian then D had made building of my plot due to his big family and we are doing agriculture work on exchanged plot(D). We knew this plot had others uncle(C) name in degree. then we try to resolve the solution but it cannot happened and other fact is that uncle(C) had building of uncle(D) in other plot in degree. One uncle(B) had made all certificate from block in last 2-3 years and want to take advantages of this. where B will get more he want to measurement by sarkari amin in that plot(current we had position) only where his name is written. Q1:-Is oral distributions 40-50 years back valid till now if position of land still have. Q2:-got a Degree but not paid stamp fee 40 years back become valid? Q3:-Exchange plot made building by other uncle without paper work. what we can do. how much chance? because he is not interested in paper work. Q4:-karmchari & amin coming for land measurement. how can we stop.we also stopped this before but they doing again and again.