story: [Melissa] is playing in the park with her son [Brian]. [Paul] is calling his sister [Melissa] to let her know it's going to start to rain. [Sabrina]'s father, [Paul], took her to school this morning.
query: ('Paul', 'Brian')
clean_story: [Melissa] is playing in the park with her son [Brian]. [Paul] is calling his sister [Melissa] to let her know it's going to start to rain.
proof_state: [{('Paul', 'nephew', 'Brian'): [('Paul', 'sister', 'Melissa'), ('Melissa', 'son', 'Brian')]}]