But when I’d said that to Rosie once, she had pointed out that everyone else would tell them about it. That I’d take my son or daughter to the school Christmas fair, and there would be Santa, giving out presents and ho-ho-hoing, and if I didn’t let my little one join the queue, they’d be left out and devastated. It was a total dilemma.
It's really not. Plenty of people do it every day. You don't even have to not let them join the present queue. You just tell them that it's pretend and a lot of people like pretending so they shouldn't spoil it for anyone else. Problem solved.
(Except for the problem of school Christmas fairs which should not exist in a modern democracy, but that's a whole other issue.)

