How to claim equal share in father's property

I am Hindu having property clash with brothers. there were two flat bought by father. father passed away.one flat we are staying together. we are also having business in r own factory. after father, mother became owner of business. then brothers were working in factory. then they sold one flat. with that money n surplus income earned from business owned by mother they bought 3 rooms in chawls. my mother were eger to give one room to me. but elder brother fought in bad way & bought room in his name. so two rooms were in his name & one were in younger brother name. after mother death they sold of these three room & flat 1 bhk flat. now they are saying I have no right in that flat & factory property. they are nt treating me equal heir in property. giving only 30 lac & they each taking 75 lacs. so I want equal part. how to claim it.