When I was a kid, I've always been told by grandparents that Santa Claus will come in the house around midnight to put some presents and toys under the tree.... I thought I believe them... when I grew up, like 12 years old I managed to sneak up at that time around midnight and I caught my grandpa did do that putting up the presents under the tree, so I know that there is no REAL Santa Claus!
BT - the true it can be Santa Claus in one of the family relatives that coming over their houses to see children to make them think that is REAL Santa!
As you know, Santa Claus might be your uncle, your dad, one of your families that you never know...
Even, I had a friend of mine saying that he saw Santa Claus was over at his house at night, but he already knew that was NOT real Santa because he found out his mom did call Santa from the newspaper ad to come over and have a good chill time!