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I can't for the life of me find a film I once saw on HBO when I was young. It had to be either late 80's or for sure from the 90's.
All I can remember is that the opening sequence dealt with an investigation by the police where the owners of a house or apartment went missing. The police search the house, meanwhile the camera pans away and reveals that the elderly couple who live there have been shrunk and stashed in a shoe box. The police either find them or a cat stumbles upon them and eats them.
It then cuts to an elderly woman walking the streets of (what I think is California) and she notices a supermodel on a billboard. She transforms herself into the supermodel before answering a personal ad for a family. By then it is revealed that she is a witch and worms her way into a family, only to do good yet evil things.
She seduces the father of this family and does weird things like casting a "love" spell on an older girl so that she will follow the fathers younger son into the locker room and do dirty things with him.
I remember a weird scene where the father and supermodel witch are making love and floating above the bed.
In the end their's a bizarre battle between the family and the witch.
I want to say it's a horror/comedy but can find zero information about it. I would LOVE to know what this film is. If you have an idea please help!