[Cindy] could n't wait to get off the plane to see her mother, [Wilhelmina]. [David] and her sister [Lynn] played golf together. [David] won easily. [Lynn] and her sister [Cindy] played golf together. [Lynn] won easily.
('Wilhelmina', 'David')
[Cindy] could n't wait to get off the plane to see her mother, [Wilhelmina]. [Lynn] and her sister [Cindy] played golf together. [Lynn] won easily. [David] and her sister [Lynn] played golf together. [David] won easily.
[{('Wilhelmina', 'aunt', 'David'): [('Wilhelmina', 'mother', 'Cindy'), ('Cindy', 'sister', 'David')]}, {('Cindy', 'sister', 'David'): [('Cindy', 'sister', 'Lynn'), ('Lynn', 'sister', 'David')]}]
['mother', 'sister', 'sister']