story: [David] and his brother [Jason] just talked on the phone for the first time in years. [Carol] loves playing chess her son. His name is [David]. [Carol] took her son [Richard] to the animal shelter to adopt a cat. [Richard]'s grandmother, [Sandra], was invited but could not make it because she had the flu.
query: ('David', 'Sandra')
clean_story: [Carol] loves playing chess her son. His name is [David]. [Carol] took her son [Richard] to the animal shelter to adopt a cat. [Richard]'s grandmother, [Sandra], was invited but could not make it because she had the flu.
proof_state: [{('David', 'grandmother', 'Sandra'): [('David', 'mother', 'Carol'), ('Carol', 'mother', 'Sandra')]}, {('Carol', 'mother', 'Sandra'): [('Carol', 'son', 'Richard'), ('Richard', 'grandmother', 'Sandra')]}]