From the start, DS did not believe at all in "the legend of Santa Claus" (how can he possibly get to all those houses on one night?) and asked me outright last year at age 7. I asked him if he wanted to believe and he said yes, and I said Santa is real to those who believe. Then, my DH but a boot print in the fireplace and my MIL wrote DS a letter from Santa. I'm a bit concerned that they went too far, and DS will be really mad when he learns what they did. He now believes wholeheartedly at age 8, and I'm feeling uncomfortable.