My sister's keeper - Jodi Picoult

In my first memory, I am three years old, and I am trying to kill my sister. Sometimes, the recollection is so clear I can remember the itch of the pillowcase under my hand, the sharp point of her nose pressing into my palm...

Anna is not sick, but she might as well be. By age thirteen, she has undergone countless surgeries, transfusions, and injections to help her sister, Kate, fight leukemia. Anna was born for this purpose, her parents tell her, which is why they love her even more.

But now she can't help but wonder what her life would be like if it weren't tied to her sister's...and so she makes a decision that for most, at any age, would be too difficult to bear, and sues her parents for the rights to her own body.