My brother lives in the US and recently went through a divorce. His wife’s father has filed a complaint against him in India under section 498A. How and where can I file a petition to have this complaint dismissed?

You can file a petition to quash the complaint under Section 482 of the Code of Criminal Procedure in the High Court where the complaint was filed. The petition should be based on the grounds that the complaint is false, frivolous, and malicious, and that your brother is not subject to Indian jurisdiction as he is a US resident.