story: [John] asked his grandad [Clarence] if he could get some sweets for him and his sister [April].
query: ('Clarence', 'April')
clean_story: [John] asked his grandad [Clarence] if he could get some sweets for him and his sister [April].
proof_state: [{('Clarence', 'granddaughter', 'April'): [('Clarence', 'grandson', 'John'), ('John', 'sister', 'April')]}]
edge_types: ['grandson', 'sister']