In the book, Cosmic, the main character, Liam, is pretending to be a grown up because he is very tall, and he really wanted to go on a special trip for a dad and kid.
Just a tip, but I know my parents do this- sweets. You need to limit sweets. From my own experience, I know that not just teens but younger kids as well get pretty crazy and scary if they get a hold of too many sweets (not naming names but I know my parents will know who I’m talking about). Don’t force them to avoid the sweets but start talking about the negative effects and it’ll get them to stop pretty soon after. Don’t watch them eating afterwards because they won’t want you to know that they actually heard you.
Teens don’t like admitting things so try to get them to stop in a way that they may not know you’re doing it. If they find out what you’re doing, they aren’t going to stop because, like I said, they will try to be stubborn and act like they can do whatever they want. But if you don’t want to read this big, long paragraph, than just remember this: limit the sweets and do it in secret!