[Nicholas] and his wife [Amy] are planning a vacation. [Nicholas]'s son [Glen] is so excited.
('Amy', 'Glen')
[Nicholas] and his wife [Amy] are planning a vacation. [Nicholas]'s son [Glen] is so excited.
[{('Amy', 'son', 'Glen'): [('Amy', 'husband', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['husband', 'son']