All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His Slave and Messenger.
We have previously explained in Fatwa 85873 the invalidity of the Indian custom of making the wife pay Mahr (dowry) to the husband. Therefore, if what your in-laws gave you was dowry, then it is unlawful for you to take; and the fact that they gave it to you through your family is irrelevant in this regard. You have to give them back all they have given you as dowry. But if they gave it to you as a gift and you accepted it and took it in your possession, then it rightfully belongs to you.
As for what the bride’s family gives her, we have detailed it in Fatwa 88939.
Allaah Knows best.