Casper (1995)

From the introduction: In this world, when one dies without proper resolution, with ‘unfinished business’, they become ghosts. One ghost, Casper, is desperate for a friend, receiving little other than abuse from his uncles, Stinkie, Stretch, and Fatso: The Ghostly Trio. Should events proceed as normal, Casper’s haunt, Whipstaff Manor, will fall under the ownership of one Carrigan Crittenden. Believing the manor to house a secret treasure, Carrigan will set in motion a course of events that may yet lead Casper to finding a true friend. You arrive in this world about an hour before Nicky and Andreas, two young boys, break into Whipstaff Manor on a dare.