Is the son obligated to pay his father's debt, knowing that the father is well-off and the son covers the household expenses shared between them, and does the son's money belong to his father?

If it was a gift or a donation, the father is not permitted to retract it after the car has been purchased, due to the change in the property. However, if the money was a loan, it must be repaid when possible, and the father's word is conclusive in determining the nature of the giving. The majority of scholars hold that the father does not have the right to take from his child's money without the child's consent if the father is self-sufficient. In contrast, some scholars permit this, even if the father is not in need, provided that he does not unduly harm his child's wealth and does not take it to give to another child. Showing kindness to one's father is a religious obligation.