Harry shrugged, "how did my mother become a witch and your mother did not? Far back in the Evan’s family there was a witch or wizard who perhaps did not express any magical traits. In our world, we call them Squibs. The magic can lay dormant for generations and then it just randomly pops up. Your mother wasn’t a witch, but she passed whatever magic she had onto you and you passed it onto Ellie. I’d even go as far as saying Lucy might have some magic in her, too. That would explain why Ellie started showing signs so early on."