[Nancy] enjoys hanging out with her sister, [Lillian]. Sometimes [Lillian]'s son, [John], takes them out for lunch.
('Nancy', 'John')
[Nancy] enjoys hanging out with her sister, [Lillian]. Sometimes [Lillian]'s son, [John], takes them out for lunch.
[{('Nancy', 'nephew', 'John'): [('Nancy', 'sister', 'Lillian'), ('Lillian', 'son', 'John')]}]
['sister', 'son']