Keeping Rooster Hatchlings

I've hatched 6 eggs and got 2 roosters. I was thinking about keeping one if I can manage the noise and agree with my neighbours.

If I do go ahead, how do I deal with the inbreeding thing? I assume he is probably going to try mate with his sisters... Obviously I wouldn't hatch any of those eggs, but is it normal to just allow that kind of weirdness in the flock?