Land Family Settlement

Dear Sir, We got A property from Muslim in 1989 and mutation on 1990 with all current slip and boundry wall also. There was 3 brother. LateX,lateY, Z We got property from Elder Son of Late X after khangi batwara written and selling their own share written on Sale deed and Uncle Z also Signed with thumb impression. Late X had 1 wife, 3 sons and 2 Daughter, Late X had One Elder Son and rest two son was minor on that time and two daughter was Major. Now after 27 year minor who became major 8 years before claiming their share during construction of house. We told just file a case to your brother and we will fight in court.Where was all of you 27 year have passed now. Now they dont want to go court but asking justice from us.Because they all are poor.But trying to stop my construction. So we met with ward Commissioner and panchnama made infront of punch on 1000 rs stamp paper with all sharer thumb impression with their sign.By giving some amount of money for settlement and not to claim in fouture for that particular of land. Now my question is That paunchnama is valid or not. Regsrds,