Congratulations! You're going to make a great aunt! The nice thing about that is you can love 'em, and spoil 'em, then give 'em back to their parents! LOL LOL
That is nice that they found out beforehand what they were having. My sister didn't, so boscibo is right...that makes it kinda hard to buy stuff.
A little girl! Yay! That should be fun for you!
Hugs to the new aunt, and congrats to your brother and sister-in-law!