When she was rebellious, I thought it was actually very simple to know what she really thought, that is, to be friends with him and not say anything. You should put down your bigger figure and take the initiative to communicate with him. You can tell him what you met and ask him to give you advice. I think every child is very self-respecting, especially in adolescence, so at this time, if he is rebellious, do you want to guide him through his own affairs and try to think in a good direction. In this case, I think even if you don't care about him, he will have a correct judgment himself. He will thank you for it and think you are right in the future.
The most irrational way to meet a rebellious brother is to make a scene with him and confront him. I don't think the child can speak at this time, so what you have to do is to let him realize his mistake from the bottom of his heart. I think it is far better to do it than to quarrel.
In short, consider the problem in his way, understand and tolerate him, and gradually he will understand your good intentions.