Casper (1995)

Furious that her late father only willed her his gloomy-looking mansion rather than his millions, Carrigan Crittenden is ready to burn it to the ground when she discovers a map to a treasure hidden in it. But when she enters it to seek her claim, she is frightened away by a wicked wave of ghosts. Determined to get her hands on this hidden fortune, she hires afterlife therapist Dr. James Harvey (Bill Pullman) to exorcise the ghosts from the mansion. James and his daughter, Kat, move in, and soon Kat meets Casper, the ghost of a young boy who's "the friendliest ghost you know". But not so friendly are Casper's uncles Stretch, Fatso, and Stinkie, who are determined to drive all "fleshies" away. Ultimately, it is up to James and Kat to help the ghosts cross over to the other side.