A Jack Production
You have two sons - 15-year old, Brandon and 18-year old Kieth.
Right now, when Kieth wants to go someplace, he uses your extra car. You and your significant other have decided to give it to him. Your SO prefers to drive the SUV, so giving up the car isn't a huge problem. However, he's been having trouble following some of the rules, and he's been griping about helping with the maintenance and care of it, so you've held off.
One problem you frequently have is that Kieth is supposed to bring the car back with the same amount of gas it had when he took it. Your SO is very good about tracking usage, so you have a good idea of how much Kieth drives it. He did okay for a while, but in the past two weeks, he's brought it back without refilling it three times. One of those times, it was almost empty, and your SO was late to work from having to stop for gas.
The first time it happened, you just reminded him of the rules. The second time, you gave him two swats with the paddle to 'help' him remember. But when the last time it happened, you decided that doing without wheels for a few days might stimulate his memory.
Brandon and Kieth are close and get along well. They have a pair of close friends who are also brothers. Those brothers are about to leave for a large part of the summer. They were able to get everything taken care of, and they now have a free day. One of them suggested a trip to the water park before they left.
The problem is, Kieth is the only one licensed to drive right now. He asks, but he can tell you're hesitant to break his grounding for something that isn't groundbreaking.
"Hey!", Kieth says, suddenly brightening up. "Brandon has his learner's permit, and I'm over 18. He could drive us."
Does that swing, would it be violating Kieth's restrictions, or do you have another alternative to offer?