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