[Kevin] took his sister [Louise] to the movies with him to see the new Star Wars film. [Nancy] could n't wait to get off the plane to see her mother, [Louise].
('Kevin', 'Nancy')
[Kevin] took his sister [Louise] to the movies with him to see the new Star Wars film. [Nancy] could n't wait to get off the plane to see her mother, [Louise].
[{('Kevin', 'mother', 'Nancy'): [('Kevin', 'sister', 'Louise'), ('Louise', 'mother', 'Nancy')]}]
['sister', 'mother']