[Nancy] and her son [Kevin] were waiting on his sister [Lorraine] to come out of band practice.
('Nancy', 'Lorraine')
[Nancy] and her son [Kevin] were waiting on his sister [Lorraine] to come out of band practice.
[{('Nancy', 'daughter', 'Lorraine'): [('Nancy', 'son', 'Kevin'), ('Kevin', 'sister', 'Lorraine')]}]
['son', 'sister']