[Nancy] is getting married. She is looking forward to her sister, [Lillian], attending. They have n't seen each other since [Lillian] relocated to California with her husband 3 years ago. [Amy] and her sister [Lillian] are the only children in their family.
('Nancy', 'Amy')
[Nancy] is getting married. She is looking forward to her sister, [Lillian], attending. They have n't seen each other since [Lillian] relocated to California with her husband 3 years ago. [Amy] and her sister [Lillian] are the only children in their family.
[{('Nancy', 'sister', 'Amy'): [('Nancy', 'sister', 'Lillian'), ('Lillian', 'sister', 'Amy')]}]
['sister', 'sister']