[Cindy] called [David], her sister, to see if she wanted to go out to eat. [Cindy] had a heart-to-heart conversation with her daughter [Anna] about some things. [David] and her sister [Lena] played golf together. [David] won easily.
('Lena', 'Anna')
[David] and her sister [Lena] played golf together. [David] won easily. [Cindy] called [David], her sister, to see if she wanted to go out to eat. [Cindy] had a heart-to-heart conversation with her daughter [Anna] about some things.
[{('Lena', 'niece', 'Anna'): [('Lena', 'sister', 'Cindy'), ('Cindy', 'daughter', 'Anna')]}, {('Lena', 'sister', 'Cindy'): [('Lena', 'sister', 'David'), ('David', 'sister', 'Cindy')]}]
['sister', 'sister', 'daughter']