[Amy] and her daughter [Mary] went to the park. [Mary] did not invite her brother [Glen] to go to the park.
('Glen', 'Amy')
[Amy] and her daughter [Mary] went to the park. [Mary] did not invite her brother [Glen] to go to the park.
[{('Glen', 'mother', 'Amy'): [('Glen', 'sister', 'Mary'), ('Mary', 'mother', 'Amy')]}]
['sister', 'mother']