They want to get married according to Hindu tradition

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Check below answers in case you are looking for other related questions:
Is it permissible to have a wedding in the Hindu manner if it is free of religious components?
Is it makrooh to have intercourse facing the direction of the qiblah?

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Related Answers:
Commentary on the hadeeth, “A woman may be married for four things…”
Seeking worldly characteristics in the fiancé and fiancée
Does saying Bismillaah at the time of intercourse protect one against major sins?
Is it permissible to have a wedding in the Hindu manner if it is free of religious components?
Is it makrooh to have intercourse facing the direction of the qiblah?

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