story: [Alfred] was adopted kid. He discovered last week that [Sandra] is his mother. [Willie] helped his brother, [Francisco], study for the chemistry exam. [Alfred] and his son [Francisco] went to the park to look for different kinds of birds. [Louise] could n't wait for the surprise birthday party that she was throwing for her brother [Francisco] next weekend.
query: ('Willie', 'Sandra')
clean_story: [Willie] helped his brother, [Francisco], study for the chemistry exam. [Alfred] and his son [Francisco] went to the park to look for different kinds of birds. [Alfred] was adopted kid. He discovered last week that [Sandra] is his mother.
proof_state: [{('Willie', 'grandmother', 'Sandra'): [('Willie', 'father', 'Alfred'), ('Alfred', 'mother', 'Sandra')]}, {('Willie', 'father', 'Alfred'): [('Willie', 'brother', 'Francisco'), ('Francisco', 'father', 'Alfred')]}]