[Pedro] went to pick up his son [Roberto] from the baseball practice. [Jennifer] took her mother [Beverly] and her grandfather [Harold] out to a restaurant for dinner. [Beverly]'s nephew [Roberto] is going with her to town.
('Pedro', 'Harold')
[Pedro] went to pick up his son [Roberto] from the baseball practice. [Beverly]'s nephew [Roberto] is going with her to town. [Jennifer] took her mother [Beverly] and her grandfather [Harold] out to a restaurant for dinner.
[{('Pedro', 'father', 'Harold'): [('Pedro', 'sister', 'Beverly'), ('Beverly', 'father', 'Harold')]}, {('Beverly', 'father', 'Harold'): [('Beverly', 'daughter', 'Jennifer'), ('Jennifer', 'grandfather', 'Harold')]}, {('Pedro', 'sister', 'Beverly'): [('Pedro', 'son', 'Roberto'), ('Roberto', 'aunt', 'Beverly')]}]
['son', 'aunt', 'daughter', 'grandfather']