Posting in AIBU to get lots of different reply's.
Just out of interest, how old were your children when, you told them about Santa? They found out about Santa? Or they asked about Santa? Also, if you told them, how did you break it to them? Or how did they find out otherwise?
My DN is 12 but a very immature 12 and at big school now and I think it's time to tell her but SIL disagrees. My reasons are that if she found out by her mum it would be less embarrassing than finding out in a group of friends or in the class where they 'could' just laugh at her. A lot of her friends are more mature than her and may possibly already know. She is very sensitive.