[Glen]'s mother, [Amy], was worried about him. He had n't been eating. [Amy] asked her father [Clarence] if she could spend the night at her friend's house.
('Glen', 'Clarence')
[Glen]'s mother, [Amy], was worried about him. He had n't been eating. [Amy] asked her father [Clarence] if she could spend the night at her friend's house.
[{('Glen', 'grandfather', 'Clarence'): [('Glen', 'mother', 'Amy'), ('Amy', 'father', 'Clarence')]}]
['mother', 'father']