The cockerel with the single comb looks to be a mix, the barred cockerel with the pea comb beside him looks like an ee or olive egger (small feathers on his shanks) the brown pullet looks ee and the first sumatra looks mixed (shouldn't have the red/brown neck) but a good side shot of each sumatra would help with telling their gender. Good luck with your birds and welcome to the world of chickens.