Grandfather Willed property in uncles name. How can we claim share?

Mere papa ki death 21yrs phele hogyi thi mere papa 4 bhai h ,sub well settled hai . hum do sisters h humari mummy ne bahut mushkil se humari jarurate puri ki But humari property humare grandfather(Jo abhi 6mnths phele expire hue) k naam PR thi unhone ye bhi nhi sochaa k humara kyaa hogaa will bnadi or teeno chacha K naam unka hissa likh diyaa or humara hissa ek chacha k bete k naam likh diyaa h condition ye h k humari mummy jab tak jivit h wahan reh sakti h but kabhi is KO sell nhi kr sakti .... Teen mess do chacha humare paksh me h buss jiske bete k naam will ki h wo tyaar nhi h .....
Ab aap btaye kyaa ho saktaa h ...kyunki humari mummy bhi us ghr ki h to unhe bhi humare papa ka hissa milnaa chahiye ...