I think I actually got more attention from my parents than my sister did, because I was the one who acted out more, was weirder, artistic (which they supported), etc. It also didn't help that I used to beat the crap out of her when we were kids. She's the exact opposite of me in every way. Relatively mellow, very sensitive, very family-oriented. (She lived with my mom after college until she got married.)
If there was a favorite, I have no idea who it might be. However, I got sent to a childrens' home, and then to a program about a year after I got out of the first place. My parents told me that they were actually considering placing me when I was 5 years old because of behavioral problems they didn't know how to address, but fortunately, they backed out. Throughout my life, I was always threatened with placement of some sort or another. I guess it's a good thing that I only ended up in two places instead of several. And the first place, as far as I'm concerned, was the best thing that ever happened to me. (My parents heartily disagree on that matter. As my mom put it "You came out of there talking like a black person.")
I always kind of felt that I was the one who had more privilege, because of the attention, even though a lot of it was negative. My sister was always kind of left by the wayside when we were younger, I think. I know that sounds twisted, because my behavior was often pathologized, but the fact of the matter is, I was getting a lot of attention, and she was getting less.
I think that the fact that I was adopted, and the oldest, might have something to do with this as well. My sister wasn't. It was the classic case of adopting because you can't conceive, and then soon after you adopt a child, you get pregnant. Then you end up with this kid who is genetically yours, and there is a different kind of bond, as opposed to this totally wild thing you adopted who you can't control, and they don't look like you.
When my cousin and his wife were considering adopting an orphan from Vietnam, my Dad said to them "Whatever you do, don't adopt." Two of my other cousins were adopted, both of whom also suffer from mental illness. (One of them is now deceased.) The one who is still alive is, as far as I know, now doing well and has a family.
Regardless, adoptees in our family have a bad track record.
Apparently, according to Ginger, there is possibly a larger percentage of adopted kids who go into programs than ones who aren't.