[Amy] is playing in the park with her son [Milton]. [George] is calling his sister [Amy] to let her know it's going to start to rain.
('George', 'Milton')
[Amy] is playing in the park with her son [Milton]. [George] is calling his sister [Amy] to let her know it's going to start to rain.
[{('George', 'nephew', 'Milton'): [('George', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']