story: [James] and his brother [Otto] watch [James]'s daughter [Mary] in her school play. [Otto] has a sister that picks on him. Her name is [Melissa].
query: ('Otto', 'Mary')
clean_story: [James] and his brother [Otto] watch [James]'s daughter [Mary] in her school play.
proof_state: [{('Otto', 'niece', 'Mary'): [('Otto', 'brother', 'James'), ('James', 'daughter', 'Mary')]}]