If a car accident occurs during a trip and a person dies, upon whom is the expiation obligatory?

Question:
He says: A teacher wanted to take a number of his students on a trip. He took some of them in his car and provided another car for the rest. He asked the students which of them was good at driving, and one of them, a student in the second year of secondary school, said, "I am." He did not have a driver's license, and the teacher did not ask him about it. The teacher got into this car with these students, and a small student in the fifth grade was riding in the open part of the car. At one of the curves, the car overturned, and this small student died. The question is: Upon whom is the fasting obligatory among these people? Is it upon the teacher, or upon the student who was driving, or upon both of them? It is known that he paid, or that both of them paid, the blood money.

Answer:
If the Sharia court ruled that both of them are liable for the blood money, then each of them owes an expiation. But if it ruled that the blood money is upon one of them, then the expiation is upon him, the one who pays the blood money. Yes.