In that case, the one with white barring must be a male.Black Copper Maran
Knowing that the father has no barring (Black Copper Maran), the only way to get a chick with barring is from a mother with barring-- and that is a sexlink cross, where only the sons have barring.
From the development of their combs & wattles, I think both chicks are probably males. The white barring on one is just an extra way to confirm it (assuming the father really was a Black Copper Maran, as you say he was "supposed to be.")