[Clarence] took his daughter [Amy] to the zoo on Saturday. [Clarence]'s wife [Ashley] could n't come as she had to work that day.
('Ashley', 'Amy')
[Clarence] took his daughter [Amy] to the zoo on Saturday. [Clarence]'s wife [Ashley] could n't come as she had to work that day.
[{('Ashley', 'daughter', 'Amy'): [('Ashley', 'husband', 'Clarence'), ('Clarence', 'daughter', 'Amy')]}]
['husband', 'daughter']