[Amy] took her son [Dennis] to the animal shelter to adopt a cat. [Dennis]'s grandmother, [Ashley], was invited but could not make it because she had the flu.
('Amy', 'Ashley')
[Amy] took her son [Dennis] to the animal shelter to adopt a cat. [Dennis]'s grandmother, [Ashley], was invited but could not make it because she had the flu.
[{('Amy', 'mother', 'Ashley'): [('Amy', 'son', 'Dennis'), ('Dennis', 'grandmother', 'Ashley')]}]
['son', 'grandmother']