[Natasha] called her mother [Cindy] to let her know she will be back home soon. [David] and her sister [Cindy] are the only children in their family. [Lena] called [David], her sister, to see if she wanted to go out to eat.
('Natasha', 'Lena')
[Natasha] called her mother [Cindy] to let her know she will be back home soon. [David] and her sister [Cindy] are the only children in their family. [Lena] called [David], her sister, to see if she wanted to go out to eat.
[{('Natasha', 'aunt', 'Lena'): [('Natasha', 'mother', 'Cindy'), ('Cindy', 'sister', 'Lena')]}, {('Cindy', 'sister', 'Lena'): [('Cindy', 'sister', 'David'), ('David', 'sister', 'Lena')]}]
['mother', 'sister', 'sister']