DS is a few weeks off 11yo, in Y6, and despite heavy hints and so forth he's still totally convinced about Father Christmas... now whether he finds out or not before Dec 25th is not particularly the issue, (have advised him not to say too much in school
) but that he doesn't go telling his younger brother and sister is the biggie.... dd is only 5 and I don't want him ruining the magic for her. OK, there's no way that they are likely to get to the age he is and still believe, but a few years more would be nice.
Am wondering how the to discuss it, so 1) he doesn't look like an idiot at school, but 2) he doesn't go on the rampage and tell the other two. I've got a notion in my head that I can enlist him as a helper, tell him me and dad are secretly santa and we'd like him to be the secret elf? "secrets" like this excite him and for an aspie he's not too bad at keeping them because his 'clues' are so oblique that the person getting them is usually more confused rather than enlightened 
Has anyone been here? And advice? Any suggestions whether you've been here or not? pleeease?