[Nicholas] wanted his son, [Dennis], to go fishing with him. [Nicholas] and his son [Glen] went to the store to by bread.
('Dennis', 'Glen')
[Nicholas] wanted his son, [Dennis], to go fishing with him. [Nicholas] and his son [Glen] went to the store to by bread.
[{('Dennis', 'brother', 'Glen'): [('Dennis', 'father', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['father', 'son']