Percy opened his mouth, then closed it again. He thought he was bad with children, but obviously Cass was on a different planet when it came to them.
"Cass, do you know how old he is?" he finally asked, knowing full well that Cass knew. "He's not going to Hogwarts, and he's not going to learn defence or transfiguration or any of that. Besides, the little fact that it's illegal, he's too young to focus his magic with any degree of accuracy, and that's if he even has developed his magic yet," Percy pointed out.
"I meant things like English, and math, and geography, and you know the basic that any child should know," he finished, trying not to laugh.