story: [Otto] was angry with his brother [Preston] for forgetting to pick him up from school. [Michelle]'s daughter [Nancy] and [Michelle]'s son [Otto] are planning a surprise birthday party for her.
query: ('Otto', 'Nancy')
clean_story: [Michelle]'s daughter [Nancy] and [Michelle]'s son [Otto] are planning a surprise birthday party for her.
proof_state: [{('Otto', 'sister', 'Nancy'): [('Otto', 'mother', 'Michelle'), ('Michelle', 'daughter', 'Nancy')]}]