story: [Crystal] and her brother [Paul] went to the department store. [Robert], [Paul]'s son, came with them. [Crystal] went out for pizza with her father [Adam].
query: ('Crystal', 'Robert')
clean_story: [Crystal] and her brother [Paul] went to the department store. [Robert], [Paul]'s son, came with them.
proof_state: [{('Crystal', 'nephew', 'Robert'): [('Crystal', 'brother', 'Paul'), ('Paul', 'son', 'Robert')]}]