['I care about my brother a lot but I think he is started to hang out with the wrong type of crowd.', 'Maybe you should talk with him about how you feel?', "Yeah, I plan on having a talk with him, but he's only 15 so I doubt he will listen to me."]
Well at least you can say you tried. Sometimes teenagers need to figure it out on their own.
I care about my brother a lot but I think he is started to hang out with the wrong type of crowd.