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