[James] took his sons [Joshua] and [Hugh] to the hockey game. [Joshua]'s son [Joseph] hates hockey and stayed home.
('James', 'Joseph')
[James] took his sons [Joshua] and [Hugh] to the hockey game. [Joshua]'s son [Joseph] hates hockey and stayed home.
[{('James', 'grandson', 'Joseph'): [('James', 'son', 'Joshua'), ('Joshua', 'son', 'Joseph')]}, {('James', 'son', 'Joshua'): [('James', 'son', 'Hugh'), ('Hugh', 'brother', 'Joshua')]}]
['son', 'brother', 'son']