Well I had the big discussion with them on Christmas Eve. It went GREAT! I wasn't sure if they'd want to hold off for another year, but my bro said that he would be OK with it as long as my niece wanted to go. She's very independent already and wanted to stay over at grandma and grandpa's house that same night. I wasn't sure if she knew what Disney World is, but when my bro said, "do you want to go to Disney World with auntie?" she FLIPPED OUT! I wish we caught it on video, but that viral video of the 3 yr old riding the train for the first time reminded me of her. This was basically her reaction:
http://i.dailymail.co.uk/i/pix/2013/02/06/article-2274444-1762C0D7000005DC-536_634x448.jpg She was so excited to go to "Mickey's house" where "the dog lives too???" (Goofy

. I showed her some videos of the water parks, which I think she is even more excited to visit. I also showed her videos of bibiddi bobiddi boutique but assured the parents that it would be my treat

My sister in law expressed some interest in joining, but my brother really wanted to leave their other baby with grandma and grandpa and have a mini-vacation just the two of them. Either way I win--and they said they would at least pay both of our airfares because I'm "giving her such a great experience"! Now I just have to secure a DVC BLT studio for 3 nights in September including one of the
MNSSHP nights. AHH I'm so HAPPY!