[Marie] visited her son [Ronald] at college. [Robert] met his brother [Pedro] for drinks after work. [Allan] and his brother [Ronald] went to the park. They threw a ball around and played with their dog. [Robert] has a son named [Allan] that looks exactly like him.
('Marie', 'Pedro')
[Marie] visited her son [Ronald] at college. [Allan] and his brother [Ronald] went to the park. They threw a ball around and played with their dog. [Robert] has a son named [Allan] that looks exactly like him. [Robert] met his brother [Pedro] for drinks after work.
[{('Marie', 'brother', 'Pedro'): [('Marie', 'son', 'Ronald'), ('Ronald', 'uncle', 'Pedro')]}, {('Ronald', 'uncle', 'Pedro'): [('Ronald', 'father', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Ronald', 'father', 'Robert'): [('Ronald', 'brother', 'Allan'), ('Allan', 'father', 'Robert')]}]
['son', 'brother', 'father', 'brother']