Hi Bryn. Mostly I'd just like to say "welcome to the DIS"! I've never been in this situation, but I would suggest carrying a note which has been signed by the child's legal guardian (or other legal guardian?) and notarized. Don't forget to take the child's birth certificate or passport along with you, too. I'm hoping others will answer, though - this is just my best guess in a situation where a non-custodial or joint-custodial parent is taking a child for a trip.