I would find him a home or make a seperate area just for him, if you want to keep him. I'm not jumping to culling because he is only doing what he is suppose to do and is to young to know the way. I have one rooster living in the house and the other one out there with 2 girls. They are about 5 months old
You could try "time out" for a few days but unless you're getting more hens, you need to figure which roos to rehome ... But I agree with Urluline Chick, cull. Are they all from the same clutch? Breeding siblings isn't recommended from what I'm told 
