Is it permissible to marry if the father took out a usurious loan to marry off his daughter, and what should she do?

The question encompassed several matters:

1. The father borrowing with interest for the son's marriage: This action is forbidden (haram). The father must repent to Allah and repay only the principal amount. If he is compelled to pay the interest, he should do so, and the sin for it falls upon the bank. 2. The validity of the marriage: The marriage is valid as long as its legal conditions have been met, as there is no connection between the father's usurious act and the marriage contract. 3. Advising the father: If the father does not repent, the son should advise him and remind him of Allah and the Last Day with gentleness and kindness.