[Robert] made dinner reservations for his sister [Tracy]. [Dorothy] is taking her nephew [Bernardo] to the park. [Harold] liked to play catch with his daughter [Dorothy]. [Tracy] talks to her son [Bernardo] every day.
('Robert', 'Harold')
[Robert] made dinner reservations for his sister [Tracy]. [Tracy] talks to her son [Bernardo] every day. [Dorothy] is taking her nephew [Bernardo] to the park. [Harold] liked to play catch with his daughter [Dorothy].
[{('Robert', 'father', 'Harold'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'father', 'Harold')]}, {('Tracy', 'sister', 'Dorothy'): [('Tracy', 'son', 'Bernardo'), ('Bernardo', 'aunt', 'Dorothy')]}]
['sister', 'son', 'aunt', 'father']