Next, he went on to say Santa Clause doesn't put the presents under the tree, so I asked "who does?"
"you do that too" came the gleeful reply. He then called Emma over so she would confirm this to silly ol' me. "Right, Emma? Santa Clause doesn't put presents under the tree, Mummy & Daddy do!" And obligingly, she confirmed.
We've been unmasked!
Oh well, he will be 6 in two weeks time...