aggression towards kids

Hey Folks, We have had Bloo, our ACD/Blue Heeler puppy since she was 5 weeks old. I hear that's a bit early to be separated from mama and litter and I assure you we didn't know until she was home already. She seems to be overly aggressive to everyone in the house - maybe that's just a puppy...

Alright folks, just a heads up this is going to be a long one. I think anyone in a similar situation as I was will enjoy reading this, knowing you can work through it! Also just a disclaimer, Kiko was our first dog so if anything sounds super obvious, or dumb, to you, just know that we had had...