Well, here's my take. It doesn't hurt to ask. We had this situation last month at Anna and Elsa and we had two Fps. The adult walked over with the preschooler and 18 year old and without asking was offered admittance. I have also been allowed admittance when I messed up (am/pm) times on an FP. I did noy ask, I was just allowed. This being said I know the CMs have some leeway (maybe not brand new earning their ears) but we have several attraction CMs, trainers and coordinators, character attendants in our circle and I hear all the stories too. Being nice is far more effective than accusatory, pretending a lack of understanding of the language or screaming, shouting, chanting, throwing something at the CM. These are all situations I have heard about...none of those people were allowed in and some warranted a call to security. So be nice, ask if you feel comfortable and don't be disappointed if the answer is no..oh and the surest way to get a no is to tell the CM you know they can make magic.