Are any of the males barred? I assume the Orp and Marans are not. If none of them are then the barred chick is a cockerel. Any non-barred, non-white male over a barred female results in black sex links.
The next chick is too young to sex. What color egg did it hatch from? Does she have true Ameraucanas or the hatchery version (which are Easter Eggers)?
Thanks for your help! The second chick hatched from a green egg- not a clue on the true Ameracauna question. The egg color means that the mother was an Ameracauna though, correct?