The problem with acid-throwing by itself is that it's not definitive. You are now locked into a situation where only definitive/final solutions will answer. You must learn to think strategically--any wasted, or inconclusive action on your part will be a defeat, and will make further action impossible. I might suggest therefore, that you begin with your brother's aspersions on your personal appearance: Neither of you is yet fully aware that his insulting remarks constitute an intolerable and actionable offence which you can neither afford to ignore nor allow to go unpunished: Warn him quietly and seriously, on the next occasion that he insults you in this manner, of the danger that he is in, and insist that he apologize--or face the consequences. And if he chooses the consequences, as likely he will, then take him down. Proceed with measured fury. Initially you might...,but this is a maneuver that must not be relied upon to subdue him--and might, with better effect, be postponed until he is already subdued and unable to resist or deflect it. In any case, before he has time to think or move away from you, you should...with a large...or...which you will have concealed nearby, ready at hand for the purpose. You should pause now and then to give him opportunity to apologize--and desist the instant that he does apologize. The latter moment is when you will also extract from him a promise not to hide your novels or CD's for the future.
· 1 decade ago