Silkie? Mix. 6-8 weeks. One has a slightly larger comb than the other and acts as bit cochise.
I am 90% sure I have a brown leghorn cockerel. 2 roos would be okay, but prefer not more than that.
Your Leghorn is a pullet, no black chest. Partridge type colors can be sexed pretty early on due to the different male/female colorations. Too early to guess for the New Hampshire. For the Silkie mixes, if it's got a noticeable comb by ten weeks old, it's usually a cockerel.
Behavior at that age is not a reliable way of determining gender. I've had plenty of bossy and assertive pullets. The chest will feather in black if male, rosy brown if a pullet. You can see the difference as soon as those chest feathers start coming in.