[Pedro] takes his wife [Dorothy] out for their anniversary. [Beverly] took her daughter [Nicole] to visit [Nicole]'s grandfather, [Harold]. [Beverly] and her sister [Dorothy] are the only children in their family.
('Pedro', 'Harold')
[Pedro] takes his wife [Dorothy] out for their anniversary. [Beverly] and her sister [Dorothy] are the only children in their family. [Beverly] took her daughter [Nicole] to visit [Nicole]'s grandfather, [Harold].
[{('Pedro', 'father-in-law', 'Harold'): [('Pedro', 'wife', 'Dorothy'), ('Dorothy', 'father', 'Harold')]}, {('Dorothy', 'father', 'Harold'): [('Dorothy', 'sister', 'Beverly'), ('Beverly', 'father', 'Harold')]}, {('Beverly', 'father', 'Harold'): [('Beverly', 'daughter', 'Nicole'), ('Nicole', 'grandfather', 'Harold')]}]
['wife', 'sister', 'daughter', 'grandfather']