It was a children's film and the family moved to a new house that had a pond but it turned out there was a gold mine under it so the drained it to get the gold but everyone in the village told them it was a bad idea. The father started getting sick so the boy and girl did it by themselves but somehow there were goblin/fairy creatures living in the back of the mine. When they accidentily released the creatures the father became really sick but the main goblin creatures placed a hand on the fathers chest and saved him.The goblin creatures then turned into fairy like things and flew away. I can't remember the name of the film I've been trying for ages. Please help!!