De acordo com esta entrevista com Bryan Singer:
“Is that the Scarlet Witch? No, that’s his little sister,” Singer said. “I even had a line which I cut, where Quicksilver’s mother says to the little girl, ‘Go up and bug your sister,’ and the little girl says, ‘She bugs me!’ You never see the older sister, but it was to imply that there is an older sister for comic book fans. I ended up cutting it.”