My kids are still very young, so I still have a long time before they start asking questions about Santa. Though, I know once they enter school, there's going to be a child who's going to tell them the "truth" about Santa. Now whether they believe the child or not is a different story.
When I was 7 years old, my best friend was a Jehovah's Witness and I knew she didn't celebrate the same holidays as me, or even her Birthday. No big deal, I knew everyone had their own beliefs. But in 1983, after Christmas I was so excited about what I got and told her everything Santa got me. Well, she then told me that there was no Santa, and that my parents actually bought the toys for me and put Santa's name on the tag.
Well I had to argue with that statement. I told her, there is a Santa. You see, my family was very poor. My brother and I didn't have a lot, but what we did have, we appreciated and loved! For Christmas that year, we got an Atari. Well, maybe for some people Atari's were not that expensive, but to our family, it WAS very expensive. Nothing, we would ever get, no matter how good we were. We knew that Santa got us stuff that he knew we would appreciate. So, when I told her that there is a Santa, because there is no way my parents could afford an Atari, No Way! Because I knew my parents were poor, that's how I just kept believing. I think after that, my best friend just dropped it. We continued to stay best friends, and never talked about Santa much after. My parents made all of our Christmas' special and memorable and I thank them for it all the time!