[Lillian] took her son, [Douglas], to the movie theater for his birthday. [Amy] 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', 'Douglas')
[Amy] 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. [Lillian] took her son, [Douglas], to the movie theater for his birthday.
[{('Amy', 'nephew', 'Douglas'): [('Amy', 'sister', 'Lillian'), ('Lillian', 'son', 'Douglas')]}]
['sister', 'son']