The two are black shoulder and the third is a blue, either dark pied or split white- white on chin and wings.
They also have tight crests, one has a tall crest too.. makes me think they may have spalding blood. However the blue boy also has tight crest yet his color is same as a normal blue young boy, shrug.
One of the black shoulder(with the shorter crest) is a male, the other one might be a male too however if it's a spalding, could be a female and only looks dark due to the spalding blood.