[Glen] asked his father [Nicholas] to tell him a bedtime story. After thinking for a bit, [Nicholas] decided to tell [Glen] about the time that he had gone fishing with his father [Clarence] when he was a kid.
('Glen', 'Clarence')
[Glen] asked his father [Nicholas] to tell him a bedtime story. After thinking for a bit, [Nicholas] decided to tell [Glen] about the time that he had gone fishing with his father [Clarence] when he was a kid.
[{('Glen', 'grandfather', 'Clarence'): [('Glen', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']