You have to give him credit for trying, Franny!
We used to get this a lot when we camped for extended periods in the summer. There would be some children who would be in our camp every day, always there at meal times etc. Sometimes they would get some. Other times we would say you have to go back to your camp now, where is your camp anyway? They would gesture somewhere up the field.
One time, after a week of this, a car slowed as it passed and we all looked on in amazement as these parents stopped, let their child out of the car by our camp and then drove off without even looking at us. I mean, that takes the piss doesn't it?