I know to activate an AP or FITS pass you need to show ID. What kind of ID is acceptable. I have 3 children 5-16-17 and they have no real ID like a driver's license.
From what I've read, your 5YO will definitely not need ID and most people report that kids up to 13-14 don't either as long as they're with "actual adults". Some people have gotten state issued ID cards for their kids to avoid problems. I would guess you either won't have to show ID or you could use a birth certificate in a pinch. Call Disney to be absolutely certain.
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