Input: Relationship: 'be home of', Argument/Subject 1: 'arundel castle', Argument/Subject 2: 'duke of norfolk'

Answer: The ancestral home of the Dukes of Norfolk , Arundel Castle , although mainly of the 19th century , is probably built on foundations dating from the 12th century or earlier and has four ghosts : a white bird , a dandy , a boy and a girl .