[David] went out to lunch with her sister [Cindy] and her son [Bobby]. [James] and his daughter [Cindy] went to Disney World together.
('James', 'Bobby')
[James] and his daughter [Cindy] went to Disney World together. [David] went out to lunch with her sister [Cindy] and her son [Bobby].
[{('James', 'grandson', 'Bobby'): [('James', 'daughter', 'David'), ('David', 'son', 'Bobby')]}, {('James', 'daughter', 'David'): [('James', 'daughter', 'Cindy'), ('Cindy', 'sister', 'David')]}]
['daughter', 'sister', 'son']