Dakota Fanning and her little sister, Elle Fanning, will star as Cameron Diaz's daughters in the film adaptation of the novel "My Sister's Keeper."

Nick Cassavates will direct the movie this March in LA.

Elle will play a girl that sues her parents for emancipation when she finds out that they only had her to be a genetic match for her sister who is dying from cancer. The girls in the book are older, but the decision to cast younger actresses was made, because Cammy was playing the mother.