[Lynn] took her son [Joseph] to [David] ([Lynn]'s sister) birthday party. [James] read his daughter [David] a bedtime story. Soon she was fast asleep.
('James', 'Joseph')
[James] read his daughter [David] a bedtime story. Soon she was fast asleep. [Lynn] took her son [Joseph] to [David] ([Lynn]'s sister) birthday party.
[{('James', 'grandson', 'Joseph'): [('James', 'daughter', 'Lynn'), ('Lynn', 'son', 'Joseph')]}, {('James', 'daughter', 'Lynn'): [('James', 'daughter', 'David'), ('David', 'sister', 'Lynn')]}]
['daughter', 'sister', 'son']