What's Wrong with Grandma?: A Family's Experience with Alzheimer's Book

Have you ever read a book that really pissed you off? Pissed you off so much all you could do was rant about it until everyone told you to just shut up? This is that book for me.
Picoult's dialogue is excellent, but her characters annoy me and the ending of this book was such a cop-out I almost wrote her an angry letter about it, but decided against it, as she'd never read it anyway.
Basically, "My Sister's Keeper" is about a family with three kids - I forget their real names, so I'm giving them fake ones: Token Boy Child, Leukemia, and Spare Parts. Mom and Dad find out about Leukemia's unfortunate diagnosis when she's just two, so they decide to have another baby - not to replace Leukemia when she inevitably bites it, but to provide Leukemia with spare parts for organ transplants. Spare Parts gets tired of being held back by her sister's needs - and in turn, Leukemia gets tired of holding her sister back; Spare Parts isn't allowed to go to overnight camp and is being forced to quit playing her favorite sport because Leukemia needs a new kidney. Spare Parts goes to a lawyer in an attempt to get medical emancipation from her parents. She winds up winning it, but dies in a car crash. Mom pulls the plug immediately, Leukemia gets a new kidney, and - even better - Leukemia is magically cured of her illness altogether. Also, there was a stupid subplot about the lawyer and social worker falling in love.
The mother character annoyed me the most here; she didn't love her daughters equally, and it showed. It really showed. She loved Leukemia the way you love a child. She loved Spare Parts the way you love that child's trust fund or college savings. She played favorites and made no attempt to hide it.
This whole book infuriated me - the very idea of having another kid just so your sick child can have her own personal organ bank sickens me. It really does. You're supposed to have a child because you will love that child, not to fill the needs of another child.