your mom sounds like a narcissistic asshole

On the bright side, she used the past tense.

That’s a complicated issue - Do you go to elaborate measures to convince your child of a socially accepted lie and let them enjoy the fun of the whole Santa myth thing or are you going to tell your child the truth so they will know that they can trust their parents to tell them the truth? Sometimes parents come to different conclusions with later children. Not knowing the situation, I’m not sure if you were actually slow as a child finding out and recognizing the truth or just played along with what you were told. At least Mom used the past tense...