[George]'s wife [Lillian] had been feeling under the weather. [George] asked his son [John] to go to the store to buy medicine.
('Lillian', 'John')
[George]'s wife [Lillian] had been feeling under the weather. [George] asked his son [John] to go to the store to buy medicine.
[{('Lillian', 'son', 'John'): [('Lillian', 'husband', 'George'), ('George', 'son', 'John')]}]
['husband', 'son']