story: [Jason] took his daughter [Myrna] out for lunch one day. [Myrna] asked if she could bring her son [William] and [Jason] said okay.
query: ('Jason', 'William')
clean_story: [Jason] took his daughter [Myrna] out for lunch one day. [Myrna] asked if she could bring her son [William] and [Jason] said okay.
proof_state: [{('Jason', 'grandson', 'William'): [('Jason', 'daughter', 'Myrna'), ('Myrna', 'son', 'William')]}]