[Amy] took her son [Dennis] to the park for the afternoon. [Amy] is [Glen]'s mother. She takes very good care of him.
('Glen', 'Dennis')
[Amy] is [Glen]'s mother. She takes very good care of him. [Amy] took her son [Dennis] to the park for the afternoon.
[{('Glen', 'brother', 'Dennis'): [('Glen', 'mother', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['mother', 'son']