It's hard to tell the adult birds as they are sitting on the roost and I can't see a body shot...but the left one (hen) looks to be a mix with possibly Brahma and the right one (rooster) looks to be a mix as well...possibly with Old English Game.
The chicks...I saw those photos on another thread you posted...that is not a black chick but a dark brown one...so I am not sure what it is.
The white one could be a White Rock. I don't think it is a Leghorn.
All of them could be mixes. Where did you get them?