[user5454]

We had a flight once where they had assigned my then six year old daughter to a seat on a separate row from the rest of us (me, wife and son) so naturally my wife took that seat and let me sit with the kids.

This was very confusing to the flight attendant. She was like "You need to sit in your seat!" to my wife and as we explained the error by the airline, she scolded us and said "but kids can't sit by themselves!" Uhm, no that's what we fixed... Rest of the flight she looked at us suspiciously as if we were up to something.