silkie x ?
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It does look like a silkie mix, "Paint color"
If you breed them together, and get Paint patterned birds(mostly white with black patches), then paint silkie cross would be right answer. If most are like this with some being solid white and some with no white then it's probably leghorn cross.
eye catching birds, whatever they are exactly. :)
Hard to sex from those pictures, sorry. At this age the boys should have plenty of shiny and pointy tipped feathers on the back by tail, neck and in crest.
In the last picture, it kind of seems the closer one might be a boy(seems to have the rooster sickle tail feathers by the tail) and the one behind is a girl..
There should be crowing and eggs in a few weeks.. they seem almost point of lay age.