My cuz Got caught caught smokin @ SCHOOL !?

LAST YR MY CUZ WENT THROUGH A TRANSITION OF BEING TOTALLY CLOSED OFF AND SUICIDAL , SO HE MOVED IN W US HIS OTHER FAMILY HIS PARENTS ARE 3000 MILES AWAY. PROB? THEY NEVER BOTHER TO DICIPLINE HIM AND I CANNOT SEEM TO EITHER CUZ I DON'T WANT HIM TO HATE ME . I'VE ALWAYS BEEN THE "COOL" CUZ TO BE NON CHALANT BUT THIS SITUATION HAS GOT ME BUGGIN WHAT TO DO . HE IS 17 AND I AM 25 I HAVE BEEN MORE LIKE A SIS TO HIM A PUNISHING HIM IS HARD PLEASE HELP!!