Ok really obscure horror movie from I believe the 80's. It's about this family who hires a maid/nanny who turns out nuts. The maid finds out 2 teen siblings are having sex with each other but they rat her out for not being able to read first and then the parents won't believe her. So she gets fired and comes back and kills them all and I believe it was on New Year's Eve or Christmas Eve.

One thing that stands out in my mind is she had given the boy or girl a keychain that made a noise when you whistled because he/she kept losing their keys and that's how she found them to kill in the end is because she whistled and the keychain made a noise. :eek:

My friends and I were talking about really odd 80's movies and this is driving me crazy now. Can anyone help please! :) Thanks!

A Judgment in Stone (1986)