[Lillian] kept picking on her sister [Nancy]. [Nancy] was so upset, she asked her brother [Dale] for some help.
('Lillian', 'Dale')
[Lillian] kept picking on her sister [Nancy]. [Nancy] was so upset, she asked her brother [Dale] for some help.
[{('Lillian', 'brother', 'Dale'): [('Lillian', 'sister', 'Nancy'), ('Nancy', 'brother', 'Dale')]}]
['sister', 'brother']