story: [Michael] was angry with his brother [Alan] for forgetting to pick him up from school. [Michael] is one of [Sandra]'s brothers. They have lots of fun together. [Clarence]'s father's name is [Alan].
query: ('Sandra', 'Clarence')
clean_story: [Michael] is one of [Sandra]'s brothers. They have lots of fun together. [Michael] was angry with his brother [Alan] for forgetting to pick him up from school. [Clarence]'s father's name is [Alan].
proof_state: [{('Sandra', 'nephew', 'Clarence'): [('Sandra', 'brother', 'Alan'), ('Alan', 'son', 'Clarence')]}, {('Sandra', 'brother', 'Alan'): [('Sandra', 'brother', 'Michael'), ('Michael', 'brother', 'Alan')]}]