Is it permissible for a male student to ride with his friend, his friend's mother, and his friend's sister in one car while going to private lessons, such that the student and his friend sit in the back seat and the friend's mother and sister sit in the front seat?

It is not forbidden to ride in a car with your colleague, his mother, and his sister, as long as you sit with your colleague on one seat, and the mother and daughter sit on another seat, while being careful to lower your gaze and avoid causes of temptation, such as speaking with the girl without need. If you fear temptation, then do not ride with them.