Thank you everyone!
Sam: Aaron's hair was white-blonde until he was in grade school, and mine was blonde until I was 4 or 5 before it became brown, so... yeah probably.
Sarah: I think the same thing! I'm always tempted to go into Photoshop and paste some blonde pigtails on her head, and then I always say "nah, that'll just look too weird". I guess we'll see when it finally starts to really grow.