[Hugh] went with his wife [David] and son [James] to see the newest superhero movie. [David] has a son named [Bobby].
('James', 'Bobby')
[Hugh] went with his wife [David] and son [James] to see the newest superhero movie. [David] has a son named [Bobby].
[{('James', 'grandson', 'Bobby'): [('James', 'son', 'Hugh'), ('Hugh', 'son', 'Bobby')]}, {('Hugh', 'son', 'Bobby'): [('Hugh', 'wife', 'David'), ('David', 'son', 'Bobby')]}]
['son', 'wife', 'son']