[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. [David] and her sister [Lynn] went to the movies. [Lynn]'s son [Clarence] stayed home with a cold.
('Cindy', 'Clarence')
[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. [David] and her sister [Lynn] went to the movies. [Lynn]'s son [Clarence] stayed home with a cold.
[{('Cindy', 'nephew', 'Clarence'): [('Cindy', 'sister', 'Lynn'), ('Lynn', 'son', 'Clarence')]}, {('Cindy', 'sister', 'Lynn'): [('Cindy', 'sister', 'David'), ('David', 'sister', 'Lynn')]}]
['sister', 'sister', 'son']