My mum

My father died 22 years ago. He did not leave any will. He had two wives. The first one did not have kids. We are four brothers and sisters(2 brothers, 2 sisters). Last month my mother passed away. My step mother is still alive and lives with her paternal family. She has been living with them before my birth.She had a fight with my father and chose to live with her brothers. After my father’s death my mum took care of all of us. She managed everything well enduring all the hardships along the way. She never spent on her self. She sacrificed her life for all of us. She educated us, performed all her responsibilities with dignity and got us married. During the time after my fathers death, brothers showed no responsibility, they were same old careless, immature persons acting irresponsibly. The only thing they were interested in was batwara. Fearing that, my mum made a will. She named one 3 storey building(80 gazz land) under both sisters name, the other one 2 storey(250 gazz) for both the brothers, in which we were all living on top floor ,after my father passed away. These houses were the source of income for her. As my brothers hardly gave any money to mum to run the household and after their marriage we gave up hope. Never ask for anything from them. The younger one had addiction of putting all the money in stocks and losing them. He is still under enormous debt. My oldest brother took control of all the property documents, while mum was still in hospital unconscious, saying on the 3rd day of her death that my mum’s will does not have any significance. They are the real heir, and they will not accept mum will. My mum made the will legally, paid the lawyer. He got mum, me and my sisters signatures on it. But not the brothers. As at that time the elder was away for job purposes and younger one was trying to get control of everything so that he can sell and put everything in stocks. To cut short… My question is…Does my mum’s will has no significance after her death? The property that my mum mentioned in the will that i am talking about are the ones where we lived. It does not include the rest of my father’s village property. I told them that my mum made a legal document and to nullify it they have to go to the court.The rest of the village property can be divided according to inheritance law.? Let me know if my understanding is right or wrong. If i am wrong please guide me and advise me. Everyone in family who knew my mum and father, said that we sisters, should not leave any penny from inheritance to such cruel sons and brothers. I would be glad if we could make a just decision.