[Harold] took his daughter [Beverly] to ballet class. [Dorothy] could n't pick up her son [Roberto] at the airport. She decided to ask her daughter [Heather] to do it. [Beverly] loves playing checkers with her sister's son. His name is [Roberto].
('Heather', 'Harold')
[Dorothy] could n't pick up her son [Roberto] at the airport. She decided to ask her daughter [Heather] to do it. [Beverly] loves playing checkers with her sister's son. His name is [Roberto]. [Harold] took his daughter [Beverly] to ballet class.
[{('Heather', 'grandfather', 'Harold'): [('Heather', 'mother', 'Dorothy'), ('Dorothy', 'father', 'Harold')]}, {('Dorothy', 'father', 'Harold'): [('Dorothy', 'sister', 'Beverly'), ('Beverly', 'father', 'Harold')]}, {('Dorothy', 'sister', 'Beverly'): [('Dorothy', 'son', 'Roberto'), ('Roberto', 'aunt', 'Beverly')]}]
['mother', 'son', 'aunt', 'father']