How to claim share in property when father and brother is treatening

My mother have a property in Patna in her name. My mother expired (last year) in November 2017. We are 3 sisters and one brothers and my father is alive and living in Village in Nalanda District. We all are married. Sequence is like this. Brother Sister Me My younger Sister. My late mother was living with Me and my younger sister. We were taking care of her. My mother's property having 2 floor. My brother is living with his wife and only son in ground floor. Me and my younger sister with my late mother is living in first floor. There are 4 rooms on ground floor and 4 rooms on first floor. Out of which 2 rooms on ground floor and 2 rooms on first floor is rented. Brother getting rent from ground floor and we are getting rent from first floor. After death of mother, my Father, My brother and his wife trying to throw us from this house and scaring us with the help of some family member. Me and my sister were taking care of my mother since 7 years. Can we claim our share?