I have 6 Roos. 1 in the coop 5 in the yard. There is one top Roo in the yard - Wilson - When I had two broody girls with chicks he watched them both. Then the younger of the two was slacking and so he started being a little rude to her. We chased him away. Yes, the chicks will scatter. They'll...
I had this happen recently. The hens ended up splitting the chicks and the Roo picked his hen. After that they were ok. Then the second hen abandoned her chicks and Wilson raised them. Don't give up on your Roo. If he's being a jerk just chase him off for a minute.