How to resolved land dispute among family

Hello sir.. V have agriculture land of 3.5acrs.. and my father have 2 siblings.... Now dry have to share above land... 20 yes back my father have purchased his uncle land of 30 guntas.. but my grandfather had done gift deed of his land of 30guntas to my father and my grandfather took notery from my fathers uncle for 30 guntas.. Now my father siblings saying dat it should come out share too.. So now what v suppose to do??