[Dorothy] played basketball with her brother [Robert]. [Dorothy]'s sister, [Tracy], watched from the sidelines. [Beverly] has a son named [Michael]. [Beverly] does n't always get along with her brother [Robert]. Sometimes they fight like siblings do.
('Tracy', 'Michael')
[Dorothy] played basketball with her brother [Robert]. [Dorothy]'s sister, [Tracy], watched from the sidelines. [Beverly] does n't always get along with her brother [Robert]. Sometimes they fight like siblings do. [Beverly] has a son named [Michael].
[{('Tracy', 'nephew', 'Michael'): [('Tracy', 'sister', 'Beverly'), ('Beverly', 'son', 'Michael')]}, {('Tracy', 'sister', 'Beverly'): [('Tracy', 'brother', 'Robert'), ('Robert', 'sister', 'Beverly')]}, {('Tracy', 'brother', 'Robert'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Robert')]}]
['sister', 'brother', 'sister', 'son']