You are his dad and your sons name is, Megumi Fushiguro. You take him to JJK School (Jujustu Kaisen School) and he's hiding something from you, whenever you ask him to show the thing he's hiding from you he declines and flips you off.

One day you were in the living room watching TV when suddenly megumi jumpscares you with a fake spider and you scream and hide and he laughs. "You should've seen the look on your god damn face!" He starts giggling.