Sorry, I see you don't live near your sibling.
Could you sibling come live with your aunt, too.
Someone needs to supervise this child. Many kids who are 15 think they don't need it, and that they are grown. All grown ups will testify to the fact that while the body may look grown, the brains functions are still that of a 15 yr old, and they are still too young to always be doing things on their own, and making their own decisions. You are old enough now, that maybe you could get guardianship or custody. Would that work? It may not be easy, but would it may be the best thing for your sibling?
Most kids look up to an older sibling. Is there any way possible for you to make sure this kid spends more time with you? Like outings that both of you like? I don't know if the kid in question is a boy or girl, so car shopping for boys, window shopping at the mall for a girl. Go play games together at the mall. You know what I mean? Keep the kid away from his friends as much as possible without letting the kid know your motives. Cause, maybe if you do this often enough the kid will begin to see what he/she was doing in a different light, and what her/his friends are doing in a different light. Just make sure to keep talk light, eventually the kid will open up more and more and more. Maybe a long car ride some weekend, that's always a help if possible. Going to a park for a picnic. Just make sure what you do that it's not possible for any of this kids friends to make themselves available to come with you. Use this as one on one. Someday, if it all works out for the best, you can tell your sibling what you did and why you did it. At least this might help, because I know my kids got real mouthy when their friends were around and they spent too much time with them, but once I pulled the carpet out from underneath their feet (I found other things to do for them) then their mouthiness went away. Is this sibling involved in ANY sport? I think EVERY child should have one organized sport per school year, and one other organized brain activity thru the school year. This also helps keep them distracted from other unpleasant activities. Good luck...any help is better than no help.
Parents need to make their first priority caring for their children. Without proper attention, direction, love, and guidance, children are apt to make poor decisions on their own. 15-year-olds are not adults, and they still need parental supervision. Instead of talking on this forum, talk to your mom and dad.
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