Op, Take one step at a time. Send the lesser amount this time without any advance notice. Don't pick up any calls after which is bound to come with abuse . Not worth it. Next stop reduce calls from there to you and you to them. Start taking care of your health. Your family deserves you at best. Go to the mall , movie or a drive and relax yourself. Don't encourage your brothers by sending the required amount. You are a good son and brother. Only they are undeserving and entitled.You are torn and in crossroads with what to do next. Its normal reaction. See a movie or go for a drive with family. Clear your head. Whatever you do don't think of being near family. Then you will come into more drain emotionally , financially and physically. Not worth it. Good Luck.