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