Throughout your life you will face a variety of tests. There are few tests greater than to love those who hurt you. You will face the deaths of loved ones and you will face illness. These do require understanding of the nature of Reality, but the greatest understanding comes when you can look upon one who acts out of fear and ignorance and send that one love.
So many in your world do not know who they are. They are blind to their Self as spirit. Because of this, they do hurtful things. Their words and actions are dark and can be painful if perceived as something that can hurt you. Understand well that nothing can hurt you-as-spirit. It is only the ego that feels pain. The soul is pure Love.
When pained by another, this is a duel between egos. Throw down your sword and surrender the ego. This is an act of power … an act of awakening. The other may continue to spar, but without an adversary, he will have to look elsewhere. By modeling right action yourself, perhaps your brother may actually catch a glimpse in your mirror of his true nature. And perhaps not … if that is his choice … but struggle not with another’s darkness. Worry only if your own light burns brightly enough.