Casper (1995)

An afterlife therapist and his daughter move into a crumbling mansion to rid it of wicked spirits. They meet a friendly young ghost named Casper and his three obnoxious uncles. Together, they must deal with the ghosts and help Casper resolve his unfinished business from his human life. As they bond and uncover secrets about the mansion, they also encounter a treasure hunt and a machine that can bring the dead back to life. In the end, Casper sacrifices his chance to become human again to save his new friend's father.