[Pedro] has a son named [Jeffrey]. [Jeffrey]'s sister is named [Rebecca], and she also has a brother named [Roberto]. [Robert] was angry with his brother [Pedro] for forgetting to pick him up from school.
('Robert', 'Roberto')
[Robert] was angry with his brother [Pedro] for forgetting to pick him up from school. [Pedro] has a son named [Jeffrey]. [Jeffrey]'s sister is named [Rebecca], and she also has a brother named [Roberto].
[{('Robert', 'nephew', 'Roberto'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'son', 'Roberto')]}, {('Pedro', 'son', 'Roberto'): [('Pedro', 'son', 'Jeffrey'), ('Jeffrey', 'brother', 'Roberto')]}, {('Jeffrey', 'brother', 'Roberto'): [('Jeffrey', 'sister', 'Rebecca'), ('Rebecca', 'brother', 'Roberto')]}]
['brother', 'son', 'sister', 'brother']