[James] was looking forward to seeing his daughter [David] and her husband [Hugh]. [Hugh]'s son [Michael] was n't able to make it though.
('James', 'Michael')
[James] was looking forward to seeing his daughter [David] and her husband [Hugh]. [Hugh]'s son [Michael] was n't able to make it though.
[{('James', 'grandson', 'Michael'): [('James', 'daughter', 'David'), ('David', 'son', 'Michael')]}, {('David', 'son', 'Michael'): [('David', 'husband', 'Hugh'), ('Hugh', 'son', 'Michael')]}]
['daughter', 'husband', 'son']