"Has. Mum has red hair." The correction came naturally, because to do otherwise was to insult the boy's intelligence and Percy wouldn't do that. He didn't add that freckles increased with age and only glamours made them disappear. Aiden could learn about women's vanity later on.
"I'm sure your mother's hair looks real nice. This," he said pointing to his own. "People often call it Weasley red. We pretty much all have it."
Percy laughed again. "Yes, that might seem strange, but it's actually quite normal. Your mum has red hair and your dad has blond hair so when you mix the colours, you get a lighter red, like mine. We can try with crayons and you'll see."
He looked up at Cass smiling. "Your dad and I have an owl too, but Hermes doesn't bite, not unless you hurt him. Does that mean that you want to meet Plato?"