story: [Fletcher] bought a book for his father [Paul]. [Sabrina] and her brother [Robert] went to the diner to eat yummy food together. [Paul] is so proud of his son. [Robert] is the son's name.
query: ('Paul', 'Sabrina')
clean_story: [Paul] is so proud of his son. [Robert] is the son's name. [Sabrina] and her brother [Robert] went to the diner to eat yummy food together.
proof_state: [{('Paul', 'daughter', 'Sabrina'): [('Paul', 'son', 'Robert'), ('Robert', 'sister', 'Sabrina')]}]