My younger rooster Impy (actually still a cockerel himself) is very good with my broody's chicks. He has basically taken over care of them during the daytime now that mama has decided she's had enough. Two of the chicks are his biological children, eggs from his hens, brooded by one of his hens. The third chick is not at all related, egg from one of my adult hens, sired by my adult roo, but brooded by Impy's hen. Impy treats all the chicks the same. I guess a roo's brain is too small to realize that one is his stepchild huh?