I'm trying to recall the name of a film I saw as a child in the 70's. Here's what I remember of it:

It had a boy (around 10-12) whose twin died (supposedely the "evil" twin) who now instructs the "good" boy to do bad things. In one scene the boy is directed to steal a ring from the finger of a dead relative, and must sever her finger to do so.

I'm not sure of the setting of the film, or whether it was American or not. But I think it ends up at the end that either there was never a twin (evil or otherwise) in the first place, and the kid himself was just doing all the bad things and blames his "twin"...

Anyway, this has been puzzling me for such a long time, now. Any help will be appreciated.

Thanks.

-Mike