Real difficult one this....I remember watching a tv show in what I think was the late 1960's. It was a Christmas ghost story and frightened the bejesus outta me!
It was about two children who had recently gone to live with their uncle or grandfather. He wasn't a nice man and had done something nasty to two previous children who had gone to live with him. I remember a scene where the living youngsters, upon hearing a noise from outside, looked out of their bedroom window and saw the ghosts (?) of the other two walking across a snowy courtyard below. The spooky part was their hugely long fingernails!!.....the show ended with the demise of the evil uncle/grandfather along with a close up of his heart burning on a (coal?) fire.
I have a double cassette tape called 'More Ghost Stories' by M.R. James, read by Michael Hordern in which this story is included - and believe me, it's a very spooky story, even when you're only listening to it! M.R. James wrote some fabulous stuff he really did.