I would not tell that lie to my kids if I had any.
I still hate my parents for all the lies they told me and Santa and XMAS are included in the lies they told. I was so embarrassed at school when I found out the hard way that Santa was a lie, that 40 years later I am still pissed off at my parents for that lie.
The tooth fairy and the easter bunny just faded away after I found out the truth about Santa.