Hi Ram,
Cowards only give threat. I really mean it.
They just want to ride on your fear.
PLEASE STOP FEARING.
I have gone through similar phase and that coward FIL never did anything in the last 2 years.
In fact, that coward FIL goes out of town on case dates.
After you receive summons for the case, contact a lawyer for the legal procedure. Then just go on.
Take precautions. Always go with couple of relatives or friends.
Give a written complaint in a local police station about your fear of in-laws.
Send the complaint copy to your in-laws home address.
With these details, ask your lawyer to apply for case transfer.
But no need to fear. Fear drains you out and does not help at all.
If possible, I suggest you expose your in-laws intention to media or face-book or to his relatives.
This will deter him from doing any harm to you.
Buy a good smart phone and record all conversations with other party and also try to video tape any incidents. This will serve as a proof for you.
I think, at this stage, you might want to go for divorce.
If it is so, prepare a divorce notice mentioning all the atrocities of the other party along with dates.
Then send the notice when they least expect it.
File the divorce case on cruelty.
When your false 498a gets proved, you will get divorce.