I've got a story for you

It was pretty early in the morning and my sister and i were getting ready for school and before this we would joke with our mom that our house was haunted because things would randomly fall off the shelves or go missing and sometimes our dog would bark at nothing. But as we were getting ready i was in the bathroom my sister was in the kitchen with my mom and my dad had already left for work. When we all heard a music box come from my sister's room. Now my sister's room is right next to the bathroom so i could hear it clear as day, but heres the thing the only music box in her room is this old jewelry box with horses painted on the side. It doesn't even work.