Ummmm... well in my opinion, you should pay back any money you agreed to pay back. This whole thing sounds kinda like "over years" so why would you be angry now? You apperently knew that he was being "favored" so why are you suprised when you have to pay up to what you agreed to. Now if you borrowed money not agreeing to pay back, that sounds kinda stupid but if you said you would, too bad. I don't know what to do about your bro but you knew this day would come so just pay what you said you would. Thats all I can give you.