[Robert] is so proud of his son. [Ronald] is the son's name. [Pedro] and his brother [Antonio] fight a lot. Despite this, they still love each other very much. [Pedro] met his brother [Robert] for drinks after work. [Dorothy] loves playing checkers with her sister's son. His name is [Ronald].
('Antonio', 'Dorothy')
[Pedro] and his brother [Antonio] fight a lot. Despite this, they still love each other very much. [Pedro] met his brother [Robert] for drinks after work. [Robert] is so proud of his son. [Ronald] is the son's name. [Dorothy] loves playing checkers with her sister's son. His name is [Ronald].
[{('Antonio', 'sister', 'Dorothy'): [('Antonio', 'brother', 'Robert'), ('Robert', 'sister', 'Dorothy')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'brother', 'Pedro'), ('Pedro', 'brother', 'Robert')]}, {('Robert', 'sister', 'Dorothy'): [('Robert', 'son', 'Ronald'), ('Ronald', 'aunt', 'Dorothy')]}]
['brother', 'brother', 'son', 'aunt']