[Nancy] drove her son [Jeff] to his soccer game. [Jeff] and his brother [Robert] wanted to backpack across Europe together once they graduated college.
('Nancy', 'Robert')
[Nancy] drove her son [Jeff] to his soccer game. [Jeff] and his brother [Robert] wanted to backpack across Europe together once they graduated college.
[{('Nancy', 'son', 'Robert'): [('Nancy', 'son', 'Jeff'), ('Jeff', 'brother', 'Robert')]}]
['son', 'brother']