ANSWER:
If they are Hindus, this is permissible as dowry is part of their religion!
This thinking is totally against the teachings of Islam. In Islam its the groom who has to give dowry (Mahr) to the bride and not the other way round.
You should tell your husband about this and that he should man up and not give in to his father’s unreasonable and unislamic demands and bring you home in the sunnah way.