I don't think I lie about father Christmas.
Yes, I talk about FC to my DC, but I also talk about characters from books and fairy tales. I don't point out that they aren't true - in fact I pretend that they are, because it is fun.
However I will admit I have been a bit
reading about some of the elaborate tales other MNers have been spinning to explain about Father Christmas - lots of talk of money being sent to the North Pole and all sorts of (imo) complicated scenarios.
I don't pretend to have all the answers when it comes to Father Christmas (or anything really
). My DC haven't really questioned much yet, but when they do, I will be going with the "I don't know, what do you think?" or "I don't know, but maybe it's because..." line. I just see it as supporting my children's imaginations
DD was talking the other day about getting a bird table for the garden. She asked me what the birds would say when they saw it. So I did an impression of lots of excited birds talking about how pleased they were. Then I told her what the squirrels would say too. Should I have instead said to her that birds and squirrels can't talk and they wouldn't say anything? I don't see how that is really any different? (and she knows by that they can't talk, but she still likes imagining they can, and I have never actually had to have a big talk with her, and say, DD, you do realise birds can't talk don't you. I assume that she will come to understand the existence Father Christmas in a similar way as she gets older)
I suppose that if you are always making-believe with your children, then FC just slots straight into that, as just another part of the make believe that you gradually start to understand might not be real.
If you are generally absolutely literal and logical with your children, then FC might stand out like a sore thumb, and it might feel a lot more like "lying" and a lot more alien to both you and your children.