[George] wanted his son, [Timothy], to go fishing with him. [John] asked his father, [George] to help him build a birdhouse.
('Timothy', 'John')
[George] wanted his son, [Timothy], to go fishing with him. [John] asked his father, [George] to help him build a birdhouse.
[{('Timothy', 'brother', 'John'): [('Timothy', 'father', 'George'), ('George', 'son', 'John')]}]
['father', 'son']