[Nancy] is taking her son, [Kevin] to the mall. She asks her sister, [Theresa] to come too.
('Theresa', 'Kevin')
[Nancy] is taking her son, [Kevin] to the mall. She asks her sister, [Theresa] to come too.
[{('Theresa', 'nephew', 'Kevin'): [('Theresa', 'sister', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['sister', 'son']