What is the name of this movie?
I want to say this movie is from the 80s/90s. It’s like a horror/sci-fi/suspense type film. It’s about a woman who is either dating the dad or married to the dad and the daughter doesn’t like her. It turns out the gf/stepmom is evil and the end scene is the daughter almost being killed by some monster in a pool. The monster comes from inside the gf/stepmom.