If you watched cable during the late 80s and 90s you might remember this little gem of television programming called Mystery Science Theater 3000. If not that's even better! I love sharing my cult TV obsessions with the uninitiated. :) This movie has an extra groan factor just for us atheists: it's all about witches and witch burnings, demons and even includes that public domain favorite "Amazing Grace."
Other than that, this is the charming story of a perfectly normal non-film-star type of fellow named Jody who stumbles onto a walnut ranch that's actually a direct entryway into a world of witches and devil-worship. The "daughter," Melissa, who looks oh so fetching in her little skirts, is actually over 120 years old. Her wildly wrinkled and murderous "great grandmother" is actually her sister Lucinda; way back when, see, a crowd of lethargic locals wanted to burn Lucinda at the stake, believing, and correctly, that she was a witch. So Samantha saved her by selling her soul to the devil.
The people who are apparently her parents? It's unclear who they are. It's never really explained. They may just be walnut farmers who happen to own a witch.