[Dale] wanted to get a good gift for his sister, [Nancy] [Clarence]'s son, [Dale], was ill and needed to be picked up at school. [Clarence] hurried to his side.
('Clarence', 'Nancy')
[Clarence]'s son, [Dale], was ill and needed to be picked up at school. [Clarence] hurried to his side. [Dale] wanted to get a good gift for his sister, [Nancy]
[{('Clarence', 'daughter', 'Nancy'): [('Clarence', 'son', 'Dale'), ('Dale', 'sister', 'Nancy')]}]
['son', 'sister']