Thanks for a response.

I'm not concerned a bit about how my girls or I or my husband would feel about the baby. We wouldn't care at all... I guess the idea is just so new that I'm trying to think of all the ramifications.
As far as her having an abortion, it's not something I would have to "live with" or not -- that's something she'll have to live with if she does it. I personally am against abortion and as far as I'm concerned it should not be an option. I also know though that my sister is very hard headed and she'll do precisely as she wants to no matter what *anyone* says, even if my parents are encouraging it.
My other concern is a conversation I had with our mother after I posted this thread. She said that she doesn't care if it's with my sister or another sibling, that she cannot accept this child because it's of mixed ethnicity. That being said - I don't give a flying hoot about my mother's opinion on this and would quickly kick her out of my life if I thought it was in the best interest of my children (I did it before for 2 years). My concern is not at all how SHE feels about it - but how the child would feel if I raised it as my own and it was not accepted by its grandmother like my other children are. (If that was the case, of course, I would require equal treatment for all or no contact with all.) But even if she wasn't in our life eventually that little one will grow up and find out that its grandma and some of it's uncles & aunts didn't want it. Would it be in the child's best interest to be raised in a stranger adoptive family where that wouldn't be an issue? Of course, then the child would grow up and think that NONE of it's Aunts or Uncles wanted it even though *I* did.
*sigh* This is so tough.