Answer:
(Fatwa: 878/L=326/TL=1432)
You should have thought over the caste prior to nikah. You did this mistake that you performed nikah secretly. Now you should convince the parents of the girl to accept the nikah. You should make dua along with planning. After Isha salah, recite ya Lateef ya Wadood (يا لطيف يا ودود) 1111 times with durood 11-11 times before and after thinking that the hearts of their parents are softened.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
