[Dorothy] was so excited to learn that her son [Roberto] got accepted into college. [Dorothy]'s son [Roberto] and son [James] went to the park together to play. [Rebecca] was celebrating her birthday with her mother [Dorothy].
('Rebecca', 'James')
[Rebecca] was celebrating her birthday with her mother [Dorothy]. [Dorothy] was so excited to learn that her son [Roberto] got accepted into college. [Dorothy]'s son [Roberto] and son [James] went to the park together to play.
[{('Rebecca', 'brother', 'James'): [('Rebecca', 'brother', 'Roberto'), ('Roberto', 'brother', 'James')]}, {('Roberto', 'brother', 'James'): [('Roberto', 'mother', 'Dorothy'), ('Dorothy', 'son', 'James')]}, {('Rebecca', 'brother', 'Roberto'): [('Rebecca', 'mother', 'Dorothy'), ('Dorothy', 'son', 'Roberto')]}]
['mother', 'son', 'mother', 'son']