story: [Dwight] and his son, [Joe], helped his father [Jason] with house chores.
query: ('Jason', 'Joe')
clean_story: [Dwight] and his son, [Joe], helped his father [Jason] with house chores.
proof_state: [{('Jason', 'grandson', 'Joe'): [('Jason', 'son', 'Dwight'), ('Dwight', 'son', 'Joe')]}]