Brothers not sharing petrimony Farm lands and Garden

My metarnal grand parents are expire long back survived with 4 Son and 4 daughters all married. Grand mother expired latter with the will to distribute farming land equally among brother however Garden was suppose to be distributed among daughters but the will was not prepared or available. Now brothers are not willing to share even the garden to women. My mother got the Vanshawali prepared from village surpanch and got the land khatiyan details from court. We went to Vaishali Bihar block CEO and applied for distribution however he informed that rule in Bihar is changed now and he can't do anything till all of the mambers are in agreement to the distribution. We would like to seek legal opinion on this. Can all four women file case to get their share in Garden and farming land or not. Will it be a langthy process as all are above 60 Years of age. Being from Muslim community, will there be saparate law working? Thanks for your support in advance. Best regards Faiz, on behalf of my mother one of the shareholder