If the second one gets any more truly red feathers at the base of the tail or on the back, right between the wings - Or any more red right on the wrists and elbows of the wings, it's likely a boy. Female Silver Duckwings are allowed and notable by salmony red on the breast, often leaking to the outer edges of the wings like her, and sometimes it leaks through the rest of the body, but if it gets serious where a normal duckwing male would have it (back and wings) then it's likely gonna be a boy, but that breast would need to get some black in it too.
The third one, so long as it keeps up a black and white patterning I'd call it a girl. Any questionable yellow or red would make a boy with that columbian pattern.
