I’m writing this as someone who has mostly lived in the US and Canada. Personally, I find the whole “lying to children about Christmas” thing just a bit weird (no judgment on those who enjoy this aspect of the holiday). But because it’s completely normalized in our culture, this is something many people have to deal with.
Two questions:
What age does this normally happen? I suppose you want the “magic of Christmas” at younger ages, but it gets embarrassing at a certain point.
And how does it normally happen? Let them find out from others through people at school? Tell them explicitly during a “talk”? Let them figure it out on their own?
My dad used to dress up as Santa Claus and bring gifts to kids at the village’s daycare… This required months of work from my mother to buy toy packs and similar stuff to separate into little assorted packages for the kids. This started before I was born, it was impossible to hide the fact from me growing up, and they never tried to pretend Santa was real, they just told me not to tell the other kids. I had no further questions or doubts to be assuaged.