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