So, I have an interesting situation - was hoping for some feedback. Two families: 1) My parents 2) My wife and kids Booked our deals separately: 1) My parents: directly thru Southwest Vacations (only staying four nights) 2) Us: Liberty Travel (seven nights @ disney) Situation: My youngest sister is going to join us - fly in on her own via Southwest (same flights) but she would stay with my parents for the first four nights and us the remaining 3. She would basically watch the little one. We're finding it difficult to add her to my parents Southwest Vacation package (cuz she wouldn't fly home with my parents) and Liberty won't add her to our room cuz we technically have four if you count the infant. So, if she flies on her own - is there a way we can get her on Disney's Magical Express Service? How strict are they? Also, at the hotels, would we have a problem just having her crash in our rooms? Any thoughts?