Everyone has their own issues, and maybe your brother has some of his own and behaving the way he is is his way of coping or something. It is too easy to judge without considering why someone might be behaving in a way that is unacceptable to you... I mean, let's face it, an NT with an aspie sister or brother who throws terrible tantrums when young might think them to be bad and a pain in the backside etc etc, yet it is their aspieness and sensory issues maybe causing the tantrum...we only see what we see, we cannot know what else is going on besides that. Just my input.
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I am diagnosed as a human being.