[Harold] went hunting with his son, [Robert]. [Louis] enjoys the company of his sibling [Dorothy]. [Harold] took his son [Louis] to soccer practice. [Dorothy] takes her son [James] to the park every Saturday.
('Robert', 'James')
[Harold] went hunting with his son, [Robert]. [Harold] took his son [Louis] to soccer practice. [Louis] enjoys the company of his sibling [Dorothy]. [Dorothy] takes her son [James] to the park every Saturday.
[{('Robert', 'nephew', 'James'): [('Robert', 'sister', 'Dorothy'), ('Dorothy', 'son', 'James')]}, {('Robert', 'sister', 'Dorothy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Dorothy')]}, {('Harold', 'daughter', 'Dorothy'): [('Harold', 'son', 'Louis'), ('Louis', 'sister', 'Dorothy')]}]
['father', 'son', 'sister', 'son']