A:
If the case is as you have mentioned, the acts of your relative will be considered of the Munkar (that which is unacceptable or disapproved of by Islamic law and Muslims of sound intellect). You should give him advice, and if he accepts it and returns to the right way, helping him with his wedding would be an act of beneficence.
However, if he does not accept advice, it will be permissible to forsake him and not to help him. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.
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