[Mary] needed to go to the store. [Mary] asked her sister [Emily] for a ride. [Amy] took her daughter [Mary] to the store to find her some new boots for the cold winter weather.
('Emily', 'Amy')
[Mary] needed to go to the store. [Mary] asked her sister [Emily] for a ride. [Amy] took her daughter [Mary] to the store to find her some new boots for the cold winter weather.
[{('Emily', 'mother', 'Amy'): [('Emily', 'sister', 'Mary'), ('Mary', 'mother', 'Amy')]}]
['sister', 'mother']