The white one on the left side of the bottom pic is definitely a white, and the white one on the right side of the bottom pic looks to be a white as well but it's hard to see the flights. I highly doubt that it is a blackshoulder though, not with the others that are in the pic. The top chick in the bottom photo (the one with more dark on it) looks to be a pied bird. And the one on the bottom of the bottom photo actually looks to be silver pied... if not it's got a whole lot more white than any normal pied I've seen.
Judging by the assortment of chicks you have, I would guess the parents were silver pied. Silver pied pairings throw whites, silver pied, and dark pied (i'm not sure if they throw "normal" pieds).
And no, no results from this thread- no one came back with the genders of the birds they posted. Ah well!