[Jeffrey] and his brother [Roberto] just talked on the phone for the first time in years. [Louis] took his nephew [Roberto] to the park to teach him how to ride a bike. [Pedro]'s son, [James], went to the candy store. [James]'s brother, [Jeffrey], went with him.
('Pedro', 'Louis')
[Pedro]'s son, [James], went to the candy store. [James]'s brother, [Jeffrey], went with him. [Jeffrey] and his brother [Roberto] just talked on the phone for the first time in years. [Louis] took his nephew [Roberto] to the park to teach him how to ride a bike.
[{('Pedro', 'brother', 'Louis'): [('Pedro', 'son', 'Roberto'), ('Roberto', 'uncle', 'Louis')]}, {('Pedro', 'son', 'Roberto'): [('Pedro', 'son', 'James'), ('James', 'brother', 'Roberto')]}, {('James', 'brother', 'Roberto'): [('James', 'brother', 'Jeffrey'), ('Jeffrey', 'brother', 'Roberto')]}]
['son', 'brother', 'brother', 'uncle']