I'm gone for half the day and this happens? *Sighs and puts all of you in three separate corners*
Nac you still need to post.

Also confiscate all your brothers games and game devises and disconnect any t.v or PC in the house until he does his chores, No talking it out, no letting him try to talk you into getting it back, No arguing. just lock it all away somewhere, tell him to do his chores and leave him to do it and don't give it back until his chores are done.
Or threaten to delete one or some of his saved games