Rebel Red

Jean lived the perfect life, and yet said perfect life was a lie. She finds her life turned upside down upon finding out Lance, of all people, is her half-brother.

Disclaimer - I don't own X-Men Evolution. This was written for the Disney Rebel prompt, where any Disney fandom could be used. Marvel was included because it is currently owned by Disney. X-Men Evolution only ever introduced Sara, but I'm also going with the idea that Lance was a sophomore and Jean a junior during the first season.