[Lena] takes her son [Irvin] to the park every Saturday. [Cindy] invited her nephew, [Irvin], over for dinner. [Cindy] is taking a trip to see her sister [David].
('Lena', 'David')
[Lena] takes her son [Irvin] to the park every Saturday. [Cindy] invited her nephew, [Irvin], over for dinner. [Cindy] is taking a trip to see her sister [David].
[{('Lena', 'sister', 'David'): [('Lena', 'sister', 'Cindy'), ('Cindy', 'sister', 'David')]}, {('Lena', 'sister', 'Cindy'): [('Lena', 'son', 'Irvin'), ('Irvin', 'aunt', 'Cindy')]}]
['son', 'aunt', 'sister']