My DD at the same age is starting to lose faith. Doesn't help that a friend of hers, a year older, knows. But I still play the santa card. She'll know soon enough, but I'll still do santa til the youngest knows the truth.
Should've seen it this year...desperation trying to do it! Went & picked DH up, got home at 8am, had to get him to take them for a drive while I got the pressies out, lol.