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