story: [Eustolia]'s grandmother [Sandra] baked cookies for her after she came home from school. [Peter] just got married to [Lisa]. He's very happy with his new wife. [Stacy] and his father [Peter] played video games all day last Saturday. [Eustolia]'s father, [Peter], took her to school this morning.
query: ('Stacy', 'Sandra')
clean_story: [Stacy] and his father [Peter] played video games all day last Saturday. [Eustolia]'s father, [Peter], took her to school this morning. [Eustolia]'s grandmother [Sandra] baked cookies for her after she came home from school.
proof_state: [{('Stacy', 'grandmother', 'Sandra'): [('Stacy', 'sister', 'Eustolia'), ('Eustolia', 'grandmother', 'Sandra')]}, {('Stacy', 'sister', 'Eustolia'): [('Stacy', 'father', 'Peter'), ('Peter', 'daughter', 'Eustolia')]}]