Facebook defamation

Defamation is a criminal as well civil wrong. File a civil suit for damages, as well as a complaint case before the magistrate of your area u/s 200 r/w 190(1)(a) of the CrpC for having committed defamation. The things that you have quoted are malicious and published with an intent to damage her reputation in the estimation of the society. They are completely devoid of good faith and are reckless. 

If these are the comments upon which you wish to base your action for defamation, she cannot be held liable in civil law as well as criminal law in my opinion as a minute scrutiny of these comments makes it very clear that they do not relate directly to you or your mother.

1. I agree to Bharat.
2. You have a good case in hand. 
3. Best is to screw happiness of your metro wife under libel damages.

Link:-

https://www.expressindia.com/latest-news/Woman-summoned-for-defaming-inlaws-with-p*rnographic-material/909027/

I agree with Both  Adv Bharat as well as Adv Ashish. (Former giving you a procedural way forward and the latter suggesting about merits just at first glance. Hence both are right.)

Philosophically you MAY probably have merits from your version, but legally to win any case you need to consult/engage legal professional.

There are many missing links, and dots to be linked to complete the whole picture.

Hence Both the above comments are absolutely correct I believe.

Law doesn't say: .........................Don't come to court unless your have complete video recording and proofs of  atrocity upon you like a r*pe' .................... its up to you whether you have urge to bring the person to justice or not ........ whatsoever the offence and victimisation.