I didn't even know that Mary-Kate and Ashley Olson had a sister but apparently she's up for the role of The Scarlet Witch in the upcoming Avengers 2 movie.

Scarlet Witch is the the second female character that joined The Avengers ranks back in issue #16 from 1965. She is also Magneto's daughter and a powerful mutant. I'm looking forward to seeing how they handle this character in the upcoming movie.