What is the ruling on a driver taking wages for his work in a car purchased by his father with usurious money, and does the sin fall on him or on his father, and what should he do concerning this money?

The father erred by taking out a loan with interest (riba), which is a declaration of war against Allah and His Messenger. He must sincerely repent, not return to such a sin, and hasten to repay the loan. As for the car, it entered his possession if he purchased it with a valid contract. There is no sin upon the son for working with it and taking his wages.