Pagadi system policy? Rights of tenants

There is 50 years old bldg G+2 each floor has 2 room in Gaothan Mumbai surbaban. We are 4 tenants in building staying (G+1) the landlord and his wife is no more alive & there are 09 legal heirs of the bldg property (03 sons , 09 Daughters Where the elder son had takeover the property and Collect rent from us provide the receipt of RS 650/- in his name Where in last month Bmc issues notice to occupiers bcz landlord does not stay in the bldg U/s 353B of MC act to take structural audit of bldg and repair work for which we informed the landlord son to take necessary steps and report to the Bmc off bt he fail to reply to us for which we informed Bmc that no response from owners sons and we are nt in stage to take steps kindly let us know T&C under the act suggests us What shall be the steps taken by us on it? Whether any agreement to be made before the repair ? If we all tenant agree to repair bldg What kind of compensate we will shall asked from the landlord ? Or how to disolve i