Idea #2

Okay, so this is my idea:

"What happens when a ghost girl haunts the house of a human boy, and their families collide?"

So basically my idea is this: This twelve-year-old boy's house becomes haunted when a family of ghosts, a mother, father, brother and sister, plus their ghost cat pet, are forced out of their previous dwelling by evil demons who threaten the lives of everybody in town. It'll be a Ghostbusters kind of thing, only with better visual effects . A haunted piano in a house that comes to life at night add to the terror. A few other important props include magic chalk, a magical fist-sized ruby and a dusty old attic.