Dear Alok, had very positive attitude: May be TOO POSITIVE.
IT CAN WORK FOR NORMAL CASES
However, in such RESERVED SPECIAL cases, to improve upon MAY TAKE CENTURIES.
By the time save families, save India.
Power & post given are misused. And honest peaceful persons suffer: We handed over Administration of Justice and Police/ Court/ Politics in their hand. Reservation for JOb/ Education Dr. Judges/ and where not?
Bless God there is no COMPULSORY reservation Quota fixed for marriage THEM also!
If someone collects Data of Such Marriages, and publish it's Result , and opinion of their Family Members, whether they are happy with their DIL and Publish it, can be eye opener for such boys planning Love Marriages, and guide them to choose Bride.
My intention is HAPPY MARRIED LIFE for all, AND NO DIVORCES – NO MORE HOUSES BREAKING , DUE TO MISMATCH.
AS IT SPOILS THE ENTIRE PEACE HAPPINESS AND HAMONY OF A WELL ESTALISHED FAMILY AT THEIR EVENINGS OF LIFE TO SEE JAIL U/S 498A & DV ACT AND WHAT NOT??
AS SUCH ATROCITY ACT IS VERY DANGEROUS, A MERE STATEMENT & YOU ARE ARRSTED.
“please suggest me what should we do?”
Do not mention her caste or use bad words with her, or her relatives, to protect you from Atrocity Act.
 If you fear for Atrocity Act, keep voice recorder ON, nearby, so sh will not be able to lodge false Complaint.
To cure may be difficult, so if all are unhappy, remove the root cause of unhappiness.
[ As such all concerned are unhappy with this unmatched relationship; Let both be happy, by proper selection. House Exchange, not house breaking]
Honey, Keep Honey, not stone covered with honey, it only break your teeth. Glass bottle of Honey should not contain hard stone inside, it may break glass bottle also. Then only broken glass piece remains with stone, Honey is gone on Floor, with minute glass pieces, useless. Let honey family bottle be safe & Happy. Remove unwanted stone from it, before it break your bottle.
Will think later for better actions & Law point to acheive it.