Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The description you gave could just be once sided and biased one. Your brother is aged 21. He is behaving erratically. Have he been diagnosed with any mental disorders? His such erratic behavior could be just because of dissatisfaction or disappointment about his worth and his life. Lot of youngsters feel such. When the elders question their behavior, they become angry. They do not want to be questioned or to be advised. Therefore they behave in such a way to keep others away from them. Just to avoid advises and questioning. They should know their self worth. They have to regain their self confidence. For that I should know what is the reason for his disappointment. Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.