I would keep testing it right up to Christmas Eve, if I was you two! These thing's can go wrong at any moment. Also, your kids look quite young, so really, mum and dad need to really get a thorough knowledge of the way the wii works!
It should be illegal to put up Christmas lights and decorations until the 1st December. I got my first xmas catalogue in July! Straight in the recycling - useful for covering up all the bottles!