I'm curious.....being her sister, why is it NOW that you've become so interested in getting to know your sister? What are your ages if you don't mind, or the age difference between the two of you that now at Christmas you want to find out who she is? Maybe this is her problem. She has no family. Adopted or not, you obviously haven't tried to make her feel as part of the family. Trying to figure out what her likes and dislikes are over the net in a book/reading forum might not be the best place to get to know your sister. Maybe you should ask her?
Well, while this may be true, I suppose a little explination is in order.
First off, I am her brother.
Second, she (and my brother, they are biological) lives with my mother and step dad. They adopted her because after me, my mother was unable to have children ever again. I live with my fatehr and step mom, 2 states away.
Third, I am not trying to figure out her likes and dislikes. I am not so far withdrawn from her that I could not simply ask her. In High School, she was pretty much your typical teen. I am 25 now, she is 22. Granted, maybe in some ways we should be closer, but when I would come home and go party with my friends I have where my family there lives, A - she had her own things going on and B - She technically shouldn't go to parties where there could be drugs or alcohol, and being her brother, I would want to be watching her.
Forth, honestly, no one really knows her. What she wants to do with her life, what goals and aspirations she has, etc etc etc. What I do know is that even she doesn't really know herself. Infact, thats what anyone and everyone will say about her, that she needs to find herself. So I thought maybe instead of just getting her a book she would enjoy, I would get her a book she would enjoy and maybe help her find herself or inspire her in some way. Now, unlike some people, I am actually taking some responsibility for this fact as well, and am taking measures to rectify the situation.
To sum that up, sure, I COULD ask her what book she would want, but it would probably be just another book that is a good read, not neccisarily a book that might actually help her as well. I hope I don't come across angry, just thought I would explain a bit better.