[Nancy] went to a movie with her sister [Amy]. [Amy] brought along her son [Dennis] who loved going to the movies with his family.
('Nancy', 'Dennis')
[Nancy] went to a movie with her sister [Amy]. [Amy] brought along her son [Dennis] who loved going to the movies with his family.
[{('Nancy', 'nephew', 'Dennis'): [('Nancy', 'sister', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['sister', 'son']