Property

I have two brothers and i am the only sister. My father was expired. We have a property i. e a house of 800 sq ft in 2000 sq ft land. Two rooms and toilet is constructed in the first floor around 300 sq ft. My father was died when he was in his railway service. So on compassionate ground my younger brother got the job. He was married and and have one daughter. My elder brother and my mother are living in this property. My elder brothers wife was expired. He is in a private job with low income.Now the problem is for the past 4 years, my younger brother and his wife never comes to home to care my mom and he is not financially helping my mother. My mother pays all the tax etc.medical expenses everything from her pension. But from 3 years my younger brother is asking for the key of room of first floor and he demands that room. My younger brothers wife is not interested to come to mom home, so she keeps on insisting my younger brother to ask for the room.My mother is not interested to give the property as he always fight with my mother and not caring her.. She wants to give the constructed house to my elder brother who is suffering with low income.Kindly solve our problem as how to part this?