Family forever?

So family is supposed to be forever, right? Beyond petty fighting, beyond minor squabbles. Family is forever. Familial ties are thicker than water, stronger than the nano-crystals holding together a diamond. But what happens when the very family that you are fighting for, biting your tongue for turns out to not care. What happens when the brother you have is an alcoholic unemployed jerk who, oh yeah, also happens to have a son of his own, and who also, by the way, calls you very unflattering names in front of his son, your nephew? Can you love a brother who does that? Can you continue to unconditionally love anyone who makes you feel less like a sister and more like a piece of dirt? This guys says no way. But I'm lucky. I have a brother who is wonderful. Unfortunately, we can't all be so lucky.