Grace the Mistress?
You have the husbands wife kill herself cause he went after the special mistress - she's valuable. Then the movie is about sinning - maybe it's Grace's thing in heaven. She kills the husband maybe because he's unattractive to her. She kills the kids cause she's a special sinner and wants to keep it for herself and kids are her subject, not a very strong girl.... she makes moaning sounds by herself near the fireplace, duplicating her sin experiences, she maybe didn't like it and ran away from heaven....
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