.... Or shall I give up?
DS aged 5 is a adamant that Santa is magic and he would have no problem whatsoever to magic him a pair of X-ray glasses.
I have tried to say they simply haven't been invented yet, but DS won't have any of that. He really really really wants X-ray glasses for Christmas and nothing else.
So I reckon I can either try to think of something that I can 'sell' to DS as being X-ray glasses (I can't believe I am even typing that)... or shatter his belief in Santa's omnipotent magic....
Wwyd?