MIL has kindly earmarked £50 for each of our DC this Xmas, which is very generous and a bit of a relief considering they'll be getting some buttons and a couple of mouldy satsumas in their stockings from us this year. 
But I know we're lucky to have this 'dilemma'.
She's asked for ideas, and I really want to spend it wisely, probably on one big pressie each (though she'd probably prefer to get quite a few wee small things but I'm hoping to persuade her!)
She's very insistent that they have something to actually open on Christmas Day, so something like e.g. vouchers for classes wouldn't cut the mustard, unfortunately.
What would your DCs' dream pressie be for this amount? DS (6.5) is very into space, rockets, geography, flags, quizzes, DD (4.5) loves physical stuff like gymnastics, also drawing and painting and DS (1.5) is too young to have that amount spent on him for goodness' sake and quite happy to play with his siblings' discarded and broken toys from 5 years ago, but MIL v adamant that they all have the same amount spent on them!
Any fab ideas gratefully received!