[Lillian] visited her brother [Dale] in New York. His sister [Amy] was there too.
('Amy', 'Lillian')
[Lillian] visited her brother [Dale] in New York. His sister [Amy] was there too.
[{('Amy', 'sister', 'Lillian'): [('Amy', 'brother', 'Dale'), ('Dale', 'sister', 'Lillian')]}]
['brother', 'sister']