You say that, but I do remember a case a while back where a mother turned up with too many underage children and a man (even more scary, according to today's media) offered (in the presence of cabin crew) to have one on his lap even though he was wearing his suit at the time. His comment was that he had kids of his own and understood the mother's dilemma having no way of getting home with all the children. The family was allowed to fly on that occasion. I've just done a quick search for it but haven't found a relevant article yet. However, I don't think it was on easyJet.
I make no comment on whether it's a good idea or not, merely that (a) it has happened in the past and (b) it can happen even if the crew know nothing of it. I only have one kid so I hope it wouldn't apply to me, and he's old enough for his own seat now
