story: [Peter] taught his daughter, [Eustolia], how to ride a bike. [Eustolia] is taking a trip to see her sister [Michelle]. [Stacy] wanted to get a good gift for his sister, [Eustolia] [Peter] was happy that his son [Erik] was doing well in college.
query: ('Stacy', 'Erik')
clean_story: [Stacy] wanted to get a good gift for his sister, [Eustolia] [Peter] taught his daughter, [Eustolia], how to ride a bike. [Peter] was happy that his son [Erik] was doing well in college.
proof_state: [{('Stacy', 'brother', 'Erik'): [('Stacy', 'sister', 'Eustolia'), ('Eustolia', 'brother', 'Erik')]}, {('Eustolia', 'brother', 'Erik'): [('Eustolia', 'father', 'Peter'), ('Peter', 'son', 'Erik')]}]