Ridiculous dialogue and a completely predictable plot. The funniest part is how, for half the movie, nobody seems particularly bothered by the fact that the father is clearly possessed by some evil force. Even his own family barely seems concerned about it. Apparently having your dad taken over by supernatural evil is just a minor inconvenience.
And the grandma is on another level entirely - she seems to give absolutely zero f**ks about anything, even when there’s a literal bloody massacre happening right at her feet. Lol.