[Lena] called [David], her sister, to see if she wanted to go out to eat. [Cindy] is getting married. She is looking forward to her sister, [David], attending. They have n't seen each other since [David] relocated to California with her husband 3 years ago. [Cindy] is the mother of a son named [Richard].
('Richard', 'Lena')
[Cindy] is the mother of a son named [Richard]. [Cindy] is getting married. She is looking forward to her sister, [David], attending. They have n't seen each other since [David] relocated to California with her husband 3 years ago. [Lena] called [David], her sister, to see if she wanted to go out to eat.
[{('Richard', 'aunt', 'Lena'): [('Richard', 'mother', 'Cindy'), ('Cindy', 'sister', 'Lena')]}, {('Cindy', 'sister', 'Lena'): [('Cindy', 'sister', 'David'), ('David', 'sister', 'Lena')]}]
['mother', 'sister', 'sister']