[Pedro] is helping his son study. His name is [James]. [Rebecca] went car shopping with her brother [Jeffrey]. [Dorothy] has been waiting around all day for her son, [Jeffrey]. [Dorothy] took her son [James] to the park.
('Pedro', 'Rebecca')
[Pedro] is helping his son study. His name is [James]. [Dorothy] took her son [James] to the park. [Dorothy] has been waiting around all day for her son, [Jeffrey]. [Rebecca] went car shopping with her brother [Jeffrey].
[{('Pedro', 'daughter', 'Rebecca'): [('Pedro', 'son', 'James'), ('James', 'sister', 'Rebecca')]}, {('James', 'sister', 'Rebecca'): [('James', 'brother', 'Jeffrey'), ('Jeffrey', 'sister', 'Rebecca')]}, {('James', 'brother', 'Jeffrey'): [('James', 'mother', 'Dorothy'), ('Dorothy', 'son', 'Jeffrey')]}]
['son', 'mother', 'son', 'sister']