[Nancy] visited her son [Kevin] at college. [George]'s sister, [Nancy], was so happy to have him home. He was home from college.
('George', 'Kevin')
[George]'s sister, [Nancy], was so happy to have him home. He was home from college. [Nancy] visited her son [Kevin] at college.
[{('George', 'nephew', 'Kevin'): [('George', 'sister', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['sister', 'son']