My Sister's Keeper

I don't know about you guys, but I get the best inspiration before, during, and after a shower. Doesn't matter how long or short the shower is, my best ideas come from there.

Anyway, I just took a shower, and I was thinking about the book My Sister's Keeper by Jodi Picoult. I haven't read the book or seen the movie, but I now the premise. For those who don't know what it's about, it's about a couple who has a very sick daughter, and they have another daughter just so the other daughter can provide whatever the sick daughter needs (in this case, I looked up, bone marrow). As I was thinking about the book, I also thought about a time when I was at either a day summer camp or a week-long stay-over bible camp and when one of the councillors asked me where my sister was. I said I didn't know, and he/she asked, "So you're not her keeper?" In that moment, I said no without hesitating, and he/she nodded her head quietly.
First off, wouldn't it be sad to be the sibling of someone who's dying, and be the only reason he/she is alive? And your only purpose of living is to keep the other person alive? What kind of life is that? What kind of parents would do that do someone who is genetically made up of them? I'm asking these questions as a non-parent, but I mean, come on. Any human being would realize that it's wrong, right? Why wouldn't the parents give up the bone marrow themselves? Couldn't they just have planned to have two kids anyway, and asked the other child when he or she was old enough to donate their bone marrow to his or her sibling?...Okay, maybe I'm thinking too much about this, but I'm serious. It's not okay.
Secondly (and I haven't looked into this), couldn't the parents in the book have genetically made bone marrow? Is that possible? I mean, we can grow organs, we can do artificial insemination...Are we not at bone marrow yet? Also, isn't there a bone marrow bank or something? Couldn't they just have gone there to find it for their daughter?
And about the event that happened in my life: am I her keeper? I don't think I've written about my sister recently, but I've gotten to find her very annoying. I've realized that she cares more about people outside her family rather than her family, which includes me. I know it's petty, but I know I care a lot more, I spend a lot more, and I do a lot more for her than she has ever done for me. These days I would really like to get away from my family, her included, which wasn't like that before. I thought I would like to live with her, away from our parents, but not anymore. It would be insufferable to live with her because she doesn't do anything except for herself in the family.

What do you guys think about the book? Are you your sibling(s)'s keeper?