I think children are more upset that their parents found it necessary to lie to them about mythological beings. At least, that's what happened with me; as a result, I developed trust issues with my parents. I stopped believing when I was 10 (yeah, I know I'm a schmuck) when I discovered my wrapped presents in my mom's closet, but I really had no doubts until I found them hidden away that year. I still don't understand why parents feel that pretending that a generous person exists is needed for children, unless they're trying to teach children about having a cruel sense of humor, but, at the very least, children should be taught that generosity has no time limit or deadline, and that it should be celebrated and observed year-round. If I ever decide to have kids, I'll tell them that Santa Claus did exist, but he only existed as a pious Saint Nicholas in Europe and didn't travel the world delivering presents, much less all in one night. He gave poor people presents and dowries to teach them how to pay it forward and to have some hope and faith in humanity, so parents give their children, family members, and (if they're hardcore) less-fortunate people in their community presents in order to honor his spirit, generosity, and love for his fellow man. Bonus points if you set a good example by taking your kids with you to deliver presents or volunteer for a charity. I know I'm no fun, but that's just me.

ik I know something was off at 5 but didn't know what is was until idk but I think the traumatic was not telling from you parents