story: [Robert] went to [Alma]'s house for dinner. [Alma] 'father, [Jason], recently went back to school.
query: ('Robert', 'Jason')
clean_story: [Robert] went to [Alma]'s house for dinner. [Alma] 'father, [Jason], recently went back to school.
proof_state: [{('Robert', 'grandfather', 'Jason'): [('Robert', 'mother', 'Alma'), ('Alma', 'father', 'Jason')]}]