story: [Rose] was playing in the sandbox with her brother [Peter]. [Sandra]'s son, [Alfred], was busy with school activities and forgot to meet his sister. [Casey] likes it when his mother, [Rose], plays the flute. [Rose] learned this skill from her mother, [Sandra].
query: ('Casey', 'Alfred')
clean_story: [Casey] likes it when his mother, [Rose], plays the flute. [Rose] learned this skill from her mother, [Sandra]. [Sandra]'s son, [Alfred], was busy with school activities and forgot to meet his sister.
proof_state: [{('Casey', 'uncle', 'Alfred'): [('Casey', 'mother', 'Rose'), ('Rose', 'brother', 'Alfred')]}, {('Rose', 'brother', 'Alfred'): [('Rose', 'mother', 'Sandra'), ('Sandra', 'son', 'Alfred')]}]