Answer
(Fatwa: 268/D=18/K=1432)
If the boy is Muslim and both have solemnized nikah according to shariah in the presence of witnesses, you should accept this nikah though reluctantly. You should ask them to return. This is the result of open meeting of boys and girls in free environment. They are not being stopped from illicit talks and free mixing; rather these things are considered as sign of fashion and progress. In this condition, it has become very difficult for the parents to save the iman of their children. We should pay great care to save our iman and thank Allah for the same.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband