WHY DO MY PARENTS GIVE MY BROTHER EVERYTHIN HE WANT!?!?!?!?

ya....so hes just 10....but i didnt get everything i wanted when i was 10!!! whenever thy say no to him....hes throws a fit and acts like hes 2....but the worst thing is.....IT WORKS!!!!! everytime he wnts something of mine.....he does the same thing and my parents lay a guilt trip on me basically forcing me to do HIS bidding!!! another bad thing....is tht thy let him do stuff tht thy only let me do when i was like 15.....hes seen rated-R movies(like herold and kumar) he plays rated M games(blitz II: the league any1?) he evn shares my curfew.....10:30!!! when i was his age...my curfew was 8!! WHY DOES HE GET ALL THIS!?!?!?!