[Harold] took his son [Louis] to a basketball game. [Louis]'s sister [Tracy] was too sick to go. [Pedro] read a bedtime story to his daughter [Heather]. [Pedro] and his sister [Tracy] went to the movies to watch the newest superhero flick.
('Heather', 'Harold')
[Pedro] read a bedtime story to his daughter [Heather]. [Pedro] and his sister [Tracy] went to the movies to watch the newest superhero flick. [Harold] took his son [Louis] to a basketball game. [Louis]'s sister [Tracy] was too sick to go.
[{('Heather', 'grandfather', 'Harold'): [('Heather', 'father', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'brother', 'Louis'), ('Louis', 'father', 'Harold')]}]
['father', 'sister', 'brother', 'father']