Grandfather

My age is 25yrs ,Before 35yrs My grandfather is well educated and has 3 sons younger 2daughter elders.i dont no he has made will r not .by knowing for me my grandfather died at small age of my father.my dad is last son of grandfather But my father only has sons and i think His daugthers Of grandfather have sons .my grandmother died before this or i dont no ,my first big father has signed for property for cheap rate ? (till the Date he has sold atleast 10 diff property ArounD 50crs without knowing ) And taken half amount from site buyer and remaining half amount will be given after registration, but after 15yrs site buyer has appealed the case.. But registration was not done.i dont no what happened judgement.2yrs left iThink who and all singned for papers i dont no .my big father has taken that amount aslo for cancelling the appeal From my family end .i dont no weather my father has signed for papers And it has registered on site buyers ,because has no visIted OnCe also till date.but my father died early past 4yrs before.We hav many problems because of 1st big father....so can we appeal against site buyer ,my 1 big Father ,And who has signed for registration(family). Because my father only read 5th or 7th ,another 1st and 2nd big fathers are govt employe. My Father his dream his to Give One and half acre to govt school In our village(more than convent sch) by collecting fund and registeRed With govt (only 10km from bangalore inter. Airport),reMainiNg Property for family...so can i appeal my side and my Younger brother Or from my mother and what will be possibilities or judgement in court? Or any help from ur side(suggestions?).