[Bernardo] needed his brother, [Aaron], to help with a problem [Dorothy] and her nephew [Aaron] played the piano together. [Harold]'s daughter, [Tracy], was busy caring for her son, [Bernardo], and could n't take his call.
('Harold', 'Dorothy')
[Harold]'s daughter, [Tracy], was busy caring for her son, [Bernardo], and could n't take his call. [Bernardo] needed his brother, [Aaron], to help with a problem [Dorothy] and her nephew [Aaron] played the piano together.
[{('Harold', 'daughter', 'Dorothy'): [('Harold', 'daughter', 'Tracy'), ('Tracy', 'sister', 'Dorothy')]}, {('Tracy', 'sister', 'Dorothy'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'aunt', 'Dorothy')]}, {('Tracy', 'son', 'Aaron'): [('Tracy', 'son', 'Bernardo'), ('Bernardo', 'brother', 'Aaron')]}]
['daughter', 'son', 'brother', 'aunt']