story: [Edward] and his father [Preston] played video games all day last Saturday. [Edward] was delayed picking up his sister, [Stacy], from class. Thankfully, [Melissa]'s mom, [Stacy], was already there.
query: ('Edward', 'Melissa')
clean_story: [Edward] was delayed picking up his sister, [Stacy], from class. Thankfully, [Melissa]'s mom, [Stacy], was already there.
proof_state: [{('Edward', 'mother', 'Melissa'): [('Edward', 'sister', 'Stacy'), ('Stacy', 'mother', 'Melissa')]}]