Pullet - her saddle feathers (lower back) are rounded and she has a small comb. By that age age a cockerel will have long pointy saddle feathers and a larger comb.
It appears so. If you were wanting backyard layers then they are perfectly fine for that but if you were wanting purebred breeders then I would not be happy.
The barred cockerel is an Olive or Easter Egger too...he has a beard and ear muffs. I see gold leakage on his wings and back so he may be a mix of Golden Cuckoo Marans and Easter Egger.
The black pullet is an Olive Egger most likely a cross of Marans and an Easter Egger. She has a beard and ear muffs. The white pullet does not have a bearfd and muffs but I suspect she is an Olive or Easter Egger as well.