Daughter�s share in father�s property?

My father left a will before his death in 1987where he clearly stated that all his 3 children should share his (self-acquired) property equally only after the death of his wife. My mother died some years ago and did not make any will. We are 2 sisters and 1 brother who would legally be the heirs of the property left by our parents. Our brother destroyed father�s will and is not willing to execute the division of the property legally and mentally haring us. One sister has been residing in the said property from the time of her marriage when our father was still alive. Our brother who is also living in that house in another floor is all the time haring us and threatening that he will see that the sisters will not get anything. We have waited already 5 years thinking that we can settle the issue amicably because we sisters care about the family honor. I would be very thankful if someone who faced a similar problem can advise us what we can do to stop our brother doing any manipulations. Can we also file a case against our alcoholic brother who has become a threat to the family members?