Thornboldt Durst was the son of Gustav and Elisabeth Durst. He and his sister were locked in the attic by their parents to "protect them from the monster in the basement" (In actuality to keep them from discovering their parents' cult). They were neglected and both died. Illusions of them will draw the Characters to the Death House and, if the characters find their remains, they will come back as ghosts. The only way to put them to rest is to put them in their graves.