My Sister's Keeper (2009)

In Los Angeles, the eleven year old Anna Fitzgerald seeks the successful lawyer Campbell Alexander trying to hire him to earn medical emancipation from her mother Sara that wants Anna to donate her kidney to her sister.

She tells the lawyer the story of her family after the discovery that her older sister Kate has had leukemia; how she was conceived by in vitro fertilization to become a donor; and the medical procedures she has been submitted since she was five years old to donate to her sister. Campbell accepts to work pro bono and the obsessed Sara decides to go to court to force Anna to help her sister.