They can end up seizing your birds and euthanizing them. And it might even prompt them to pass a no chickens at all ordinance. It's a simple enough rule. No roosters. Don't put other peoples' flocks in your area at risk.
At 3 months old, the comb is too red for a pullet. Since one chick was a mix, it's a pretty sure bet that the other is likely a mix as well. Even if it does look like a Barred Rock. And you can't assess gender with the typical dark barring/light barring rules.
I'm pretty sure there is male...