I NEED help with TEENAGERS?

Step back and take a deep breath. Teenagers are frustrating. You need to realize that you can't have both hats on, you are either a guardian or a sister, can't be both. You need to talk to your sister, whether she talks to you or not. She needs to listen. Brandon is not family, no matter how long you knew him. If they are seeing each other, all bets are off. That game they played was inappropriate and wrong. What are they doing when you really are not there. Brandon did not look up to you. He is her boyfriend and though he may be a nice guy he is still a guy. He has hormones that are taking over his judgment. Have you talked to your sister about , you need to and explain it's consequences. You also have to tell them how hard it is to be in charge. If you apologized then it is up to them to accept it or not. Be the grown up. Sometimes that means you are the bad guy.