strange “children’s” movie

I remember seeing a movie on tv when I was little about some kids in a big old house. There was also a talking door knob that was a character. The movie revolved around these kids running away from a large hairy monster in the house where towards the end one of the kids gets his head bit half off by the monster. And some sort of miraculous healing affair takes place and he gets healed. Strange movie but I would love to know what its called.

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