[Nicholas] loved teaching his son, [Glen], baseball. [George] and his brother [Nicholas] played at jacks.
('George', 'Glen')
[George] and his brother [Nicholas] played at jacks. [Nicholas] loved teaching his son, [Glen], baseball.
[{('George', 'nephew', 'Glen'): [('George', 'brother', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['brother', 'son']