My granddad is going to be Father Christmas for the school this year (he's a regular at different venues each year, first time he's done it for the school). My eldest who's 6 is very down to earth, understands that FC doesn't go to all the places and Grandpa is a helper, so she's actually looking forward to seeing him. My younger daughter (4 at New Year) isn't talking much yet so I don't know what she understands.
Would you take the 4yo to see FC/ Grandpa or just not say anything and leave her at home?