story: [Vincent] went to the park with his father, [James]. [James] and his father [Jason] played video games all day last Saturday.
query: ('Vincent', 'Jason')
clean_story: [Vincent] went to the park with his father, [James]. [James] and his father [Jason] played video games all day last Saturday.
proof_state: [{('Vincent', 'grandfather', 'Jason'): [('Vincent', 'father', 'James'), ('James', 'father', 'Jason')]}]