My girlfriend has been bugging me about a movie she saw many years ago. According to her it's about a family that moves into a house but every night the two children witness the deaths of two other children and they have to find a way to stop the curse. Don't know if it's 80's or early 90's. Hope someone knows. Thank you.

Could this be 'Amityville'?

No, she says it's not. The movie concentrates on the kids spirits who can't rest.

Possibly The Amazing Mr. Blunden
-or-
Child of Glass
(I'm leaning towards The Amazing Mr. Blunden - found some info on it from another site where someone is looking for the film that you have described... )

Yes! Now she can rest in peace. Thank you. It's The Amazing Mr. Blunden.

:)