[Clarence] read a bedtime story to his daughter [Amy]. [Amy] went shopping with her son. His name is [Dennis].
('Dennis', 'Clarence')
[Amy] went shopping with her son. His name is [Dennis]. [Clarence] read a bedtime story to his daughter [Amy].
[{('Dennis', 'grandfather', 'Clarence'): [('Dennis', 'mother', 'Amy'), ('Amy', 'father', 'Clarence')]}]
['mother', 'father']