[George] got mad at his brother [Nicholas] after he stole his pretzels. [John] asked his father, [George] to help him build a birdhouse.
('Nicholas', 'John')
[George] got mad at his brother [Nicholas] after he stole his pretzels. [John] asked his father, [George] to help him build a birdhouse.
[{('Nicholas', 'nephew', 'John'): [('Nicholas', 'brother', 'George'), ('George', 'son', 'John')]}]
['brother', 'son']