The black and white barring is a dominant gene and will be seen in the offspring of a barred daddy. Your roosters daddy was probably a barred rock (based on his single comb) and his mama maybe a white rock. He is most likely a black sex-link rooster. I agree that the hen is probably a second generation red sex link. My Booger has feathered legs due to his light brahma mama (lol @ brahma mama). He also has a modified comb due to his parents' straight and rose comb combo. He is HUGE.