[Harold] and his son [Pedro] went to the skating rink. [Harold] was so proud that his son [Pedro] won the science fair! [Louis] and his sister [Marie] went to the movies to watch the newest superhero flick. [Harold] went to pick up his son [Louis] from the baseball practice.
('Harold', 'Marie')
[Harold] was so proud that his son [Pedro] won the science fair! [Harold] and his son [Pedro] went to the skating rink. [Harold] went to pick up his son [Louis] from the baseball practice. [Louis] and his sister [Marie] went to the movies to watch the newest superhero flick.
[{('Harold', 'daughter', 'Marie'): [('Harold', 'son', 'Pedro'), ('Pedro', 'sister', 'Marie')]}, {('Pedro', 'sister', 'Marie'): [('Pedro', 'brother', 'Louis'), ('Louis', 'sister', 'Marie')]}, {('Pedro', 'brother', 'Louis'): [('Pedro', 'father', 'Harold'), ('Harold', 'son', 'Louis')]}]
['son', 'father', 'son', 'sister']