he actually is a teen. He's a high school. William is fifteen years old
"How have you been, son?" Richard asked which caused William to sigh. He was putting on an act for these people. Now he was annoyed. The teen frowned, he wasn't willing to pretend like everything was okay between him and his family because that wasn't the case.
"Kanao!" The younger slayer glanced at him and smiled as she approached him. Her and Kanao were pretty close, their relationship was pretty close to that of brother and sister, though they would probably never admit that.