"Most of the mutant stuff is public," Edie explains out loud to Pen. "But there are things we still usually keep secret. A lot of mutants have physiological changes, like Warren's wings that Emily told you about, or Ororo's white hair and the Professor's sister's blue skin. I don't know if you're familiar with the phenomenon if you've only been in your own world most of your life...anyway. Emily and I are actually sisters. Our parents are...technically hermaphrodites, I guess? Medically, anyway--they look like men to any external examination, and neither would identify as anything else, but. Normally we don't admit to people who aren't part of the school that we're sisters, and it gets...wearing."