story: [Donald] and [Russell] are brothers. [Jason] is father of their father
query: ('Jason', 'Russell')
clean_story: [Donald] and [Russell] are brothers. [Jason] is father of their father
proof_state: [{('Jason', 'grandson', 'Russell'): [('Jason', 'grandson', 'Donald'), ('Donald', 'brother', 'Russell')]}]
edge_types: ['grandson', 'brother']