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