[Nancy] is looking for a good gift for her sister [Lillian]. [Lillian] was playing in the sandbox with her brother [Dale].
('Nancy', 'Dale')
[Nancy] is looking for a good gift for her sister [Lillian]. [Lillian] was playing in the sandbox with her brother [Dale].
[{('Nancy', 'brother', 'Dale'): [('Nancy', 'sister', 'Lillian'), ('Lillian', 'brother', 'Dale')]}]
['sister', 'brother']