Domestic violence act

There is no remedy as such. You need to speak to criminal lawyer of you locality.Every thing will considered on merits of case.

Depends on the facts of the case.  If the sister is not in a domestic relationship with the wife, the sister can move an Application from dropping her name or directly approach the High Court.  

Dear Sir/Madam,

Since your case is complicated case as such I require documents and same may be send to my email/PM (personal mail) for detailed legal advise.

With regards,

Legal Expert