[Nancy] is looking for a good gift for her sister [Amy]. [Amy] sat anxiously in the airport terminal, waiting to see her son [Milton] walk through the gate.
('Nancy', 'Milton')
[Nancy] is looking for a good gift for her sister [Amy]. [Amy] sat anxiously in the airport terminal, waiting to see her son [Milton] walk through the gate.
[{('Nancy', 'nephew', 'Milton'): [('Nancy', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']