My sister's keeper

Basically the story is continuing on almost nuetral. As if its a day by day basis and not many interesting things happen. Some arguments here and there but nothing really exciting. The main character in the book is Anna. She is the sister of a leukemia patient that goes to her for all the transplants she needs. Anna is very bright and mature for her, which is probably a side effect from being in the hospital waiting for her sister all the time. She doesnt act like a you would think a thirteen year old would act. Her maturity level is far exceeding her age. She believes that she was only born to be a holding cell for her sisters needs, and i believe this affects her extremely. She doesnt have a "normal" life, or anything to it. In my opinion, it seems like Anna would be closer with her brother rather than her sister. This is because he doesnt constantly need watching and he is somewhat "normal" which i think makes her feel a little less singled out. I feel bad for her that she feels so transparent and only useful as a recourse. I think if i were in her position i would talk to my parents about how i feel. Maybe she does after a while but i havent quite gotten there yet.