Frightmare (1975)

In 1957 Dorothy and Edmund Yates were committed to an institution for the criminally insane she for acts of murder and cannibalism and he for covering up her crimes Fifteen years later they are pronounced fit for society and released However in Dorothys case the doctors may have jumped the gun a bit Edmund and eldest daughter Jackie try to discover just how far Mothers bloodlust has taken her Meanwhile youngest daughter Debbie begins to explore the crazy roots of her family tree as fully as possible