story: [Nancy] called [Melissa], her sister, to see if she wanted to go out to eat. Once [Melissa] went inside her home safely, her brother [Otto] took his daughter [Ellen] to preschool.
query: ('Melissa', 'Ellen')
clean_story: Once [Melissa] went inside her home safely, her brother [Otto] took his daughter [Ellen] to preschool.
proof_state: [{('Melissa', 'niece', 'Ellen'): [('Melissa', 'brother', 'Otto'), ('Otto', 'daughter', 'Ellen')]}]