relationship between brother and sister

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I have a brother and were close were only 2 together I have a family right now but still we are close. He is a shy type person very rear to speck only if you talk to him he will talk he is happy alone or in other words he is a loner we grew in a broken family sometime I think he is like that because he is not happy our mother were not here since childhood only my father is always here for us. Sometimes I dont know what to do I face a problem he is became very hard to understand all his decission is final sometimes I want to gave up. I have family to take care but brother is always a brother to me and I'm only the one who is here for him. I try to understand him but until when... Do you have brother that is so hard to understand and all his decission is hard to break can someone tell me what to do I know I try everything but until when? what if I'm far from him and the people around him are same as he what will happento my brother.