[Nancy] watched a movie with her sister [Theresa]. [Nancy]'s son [Kevin] was playing video games instead.
('Theresa', 'Kevin')
[Nancy] watched a movie with her sister [Theresa]. [Nancy]'s son [Kevin] was playing video games instead.
[{('Theresa', 'nephew', 'Kevin'): [('Theresa', 'sister', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['sister', 'son']