story: [Myrna] cooked dinner for her son [Alfred] and her father [Jason].
query: ('Jason', 'Alfred')
clean_story: [Myrna] cooked dinner for her son [Alfred] and her father [Jason].
proof_state: [{('Jason', 'grandson', 'Alfred'): [('Jason', 'daughter', 'Myrna'), ('Myrna', 'son', 'Alfred')]}]