[Amy] needed to go to the store. [Amy] asked her sister [Nancy] for a ride. [George] and her sister [Amy] decided to take a trip to Mexico together.
('Nancy', 'George')
[Amy] needed to go to the store. [Amy] asked her sister [Nancy] for a ride. [George] and her sister [Amy] decided to take a trip to Mexico together.
[{('Nancy', 'brother', 'George'): [('Nancy', 'sister', 'Amy'), ('Amy', 'brother', 'George')]}]
['sister', 'brother']