[Louis]'s sister, [Dorothy], participated in the dance contest. [Antonio] and his brother [Robert] went to the boxing match. [Dorothy] was upset her brother [Antonio] did n't invite her. [Harold] and his son [Louis] went to the store to by bread.
('Harold', 'Robert')
[Harold] and his son [Louis] went to the store to by bread. [Louis]'s sister, [Dorothy], participated in the dance contest. [Antonio] and his brother [Robert] went to the boxing match. [Dorothy] was upset her brother [Antonio] did n't invite her.
[{('Harold', 'son', 'Robert'): [('Harold', 'son', 'Antonio'), ('Antonio', 'brother', 'Robert')]}, {('Harold', 'son', 'Antonio'): [('Harold', 'son', 'Louis'), ('Louis', 'brother', 'Antonio')]}, {('Louis', 'brother', 'Antonio'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Antonio')]}]
['son', 'sister', 'brother', 'brother']