I agree that 1, 2, and 3 are looking like pullets, and 4 is a cockerel. Not 100% convinced 5's male, though (although there's a good chance of this), so is there any way you could update us in a couple weeks?
IF the dad does not have any barring, then #4 is definitely a boy.
Barring is a sex linked trait. Girls can't get the barring gene from their mom, only their dad. So if dad is not barred, that's a boy that got the barring gene from the mom.