I used to watch a film, it was always on around Christmas time in the 90's. It was based about a brother and his older sister in a big house with a kind of fairy tale back garden. In fact, they found fairies there. The end of the film has these type of big troll/ogre creatures (what the films based around) in a cave or basement type place and I'm pretty sure they kidnapped the dad or something...
And ideas?

I think I'm looking for the same movie, I have a scene stuck in my head but that's it and I can't remember what it's called. Do you remember if it's american or british?