[Louis] hit his brother [Antonio] in the head. [Antonio] and his brother [Louis] went to the movies. [Antonio] wanted to see an action movie, but [Louis] convinced him to go to a horror film instead. [Robert] was playing football with his brother, [Pedro]. [Robert]'s brother, [Louis], had a broken leg and could only watch.
('Louis', 'Pedro')
[Antonio] and his brother [Louis] went to the movies. [Antonio] wanted to see an action movie, but [Louis] convinced him to go to a horror film instead. [Louis] hit his brother [Antonio] in the head. [Robert] was playing football with his brother, [Pedro]. [Robert]'s brother, [Louis], had a broken leg and could only watch.
[{('Louis', 'brother', 'Pedro'): [('Louis', 'brother', 'Antonio'), ('Antonio', 'brother', 'Pedro')]}, {('Antonio', 'brother', 'Pedro'): [('Antonio', 'brother', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'brother', 'Louis'), ('Louis', 'brother', 'Robert')]}]
['brother', 'brother', 'brother', 'brother']