Assuming, your sister marriage comes under "Hindu Marriage Act"; Divorce can be of two types - Mutual consent (where both husband and wife agree to divorce) or Contested (One of the party seeks divorce ). Initially, a legal notice has to be sent giving a time-frame to respond, thereafter depending on the outcome, suit has to be filed. Even after filing of the suit at court, you can ask for mediation and arrive at a settlement so as to avoid long legal battles. However, getting the case resolved at Mediation depends on the opposite party also. Identify a local lawyer who would be easily accessible and who will be able to complete the case at mediation level. You can also lodge a compliant with jurisdictional police station under Domestic Violence Act .
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