[Bernardo] and his brother [Bobby] were rough-housing. [Tracy], [Bobby]'s mother, called from the other room and told them to play nice. [Aaron] took his brother [Bernardo] out to get drinks after a long work week. [Tracy] has a son called [Bobby]. Each day they go to the park after school.
('Aaron', 'Bobby')
[Aaron] took his brother [Bernardo] out to get drinks after a long work week. [Bernardo] and his brother [Bobby] were rough-housing. [Tracy], [Bobby]'s mother, called from the other room and told them to play nice. [Tracy] has a son called [Bobby]. Each day they go to the park after school.
[{('Aaron', 'brother', 'Bobby'): [('Aaron', 'mother', 'Tracy'), ('Tracy', 'son', 'Bobby')]}, {('Aaron', 'mother', 'Tracy'): [('Aaron', 'brother', 'Bernardo'), ('Bernardo', 'mother', 'Tracy')]}, {('Bernardo', 'mother', 'Tracy'): [('Bernardo', 'brother', 'Bobby'), ('Bobby', 'mother', 'Tracy')]}]
['brother', 'brother', 'mother', 'son']