I too agree with Advocate T. Kalaiselvan's opinion which I'm sure is based on his experience, not biases. While there is a one percent or so chance that the author may be telling the truth, I would bet my money that she is seeking advice on how to file a counter case on the 498a-filing-family.
Kiran, I will advice u even though u may be the brother himself pretending to be ur sister: never file a criminal case first even if the inlaws r threatening 498a. If 498a is already filed on u guys: try to file true cases. I mean find something illegal that ur brother's 498a-inlaws r doing and build a case on that. A false case should be the last option because of it’s traps. If it could be clearly proven that the case/FIR is false, u guys will face the ire of IPC 186 and 211. U would also attract a lot of other sections involving perjury etc. A false case needs to be planned carefully with keeping in mind the call records, mobile tower locations of everyone involved on the day of the incident etc. By keeping in mind how intelligent ur witnesses will be: once I was using another person’s dental insurance and on the dentist's register I signed my own name with my own address; the assistant said, “uhhh, the insurance is not under ur name.” So u see a lie has so many weaknesses. Can u trust ur false witnesses? Because once my own sister, out of anger, reported us to the car insurance company about a benign fraud.
If I were u and a false-498a has already been filed on me, I might go ahead and file a false case knowing full well the potential backlash from it. When a person is cornered and their life is on the verge of destruction by the incompetent justice system of this country, they may not have any other choice but to become a chamaeleon and act in the same colours as the enemy. Once u start injecting the same venom into the enemy that was injected into u, ur enemy will most likely call for truce.(This is never a guarantee)