Okay brother, let me explain how fucking retarded your logic is. Your only sister, aka the only person other than you (assuming you don't have any other siblings), is a coalburner. We get that.
If you kill yourself, she will be the only person carrying on your family blood. If she race-mixes, you're there to do the right thing and not knock up a mudrace. If you kill yourself over your dumb whore sister fucking a nigger, guess what? Your family is doomed to muttery forever.
Don't kill yourself, retard. Go out and fuck a beautiful white woman and carry on your family legacy.