My son doesn't believe in Santa anymore. Last year his stepmother bought a gift for his stepsister in front of him and then put a Santa tag on it and he figured it out.
I've tried so hard to preserve Santa and true to his heritage, he stayed partially in denial up until now. Every time the subject came up, I played up on my ineptness and said "seriously do you think I could do all that by myself? Don't be crazy" and he bought it.
I'm really sad about it this year. I know it was a miracle he made it so long, but there are no more kids who believe in Santa and I'll never get to have more kids so it's over.