[Nancy] and her husband [Wayne] took a cruise. [Wayne]'s son [Jacob] watched their dogs while they were gone.
('Nancy', 'Jacob')
[Nancy] and her husband [Wayne] took a cruise. [Wayne]'s son [Jacob] watched their dogs while they were gone.
[{('Nancy', 'son', 'Jacob'): [('Nancy', 'husband', 'Wayne'), ('Wayne', 'son', 'Jacob')]}]
['husband', 'son']