You need not to worry about this this is very common in estate you can also go to the police station of your area and file complaint under Section 498 a of IPC and Domestic Violence Act against the husband and his family also at the same time you can file a Restoration of conjugal right petition in the court as the divorce petition is still pending and in case your sister is not working you can file a maintenance case under section 125 CrPC for the maintenance and legal expenses of your system from the husband