[George] went to the movies with his son [John]. [George]'s wife [Lillian] stayed home to cook dinner.
('Lillian', 'John')
[George] went to the movies with his son [John]. [George]'s wife [Lillian] stayed home to cook dinner.
[{('Lillian', 'son', 'John'): [('Lillian', 'husband', 'George'), ('George', 'son', 'John')]}]
['husband', 'son']