[Constance] asked her sister [Stephanie] if she could come over for dinner. [Stephanie] told her she could n't, because she had to care for her sick son, [William].
('Constance', 'William')
[Constance] asked her sister [Stephanie] if she could come over for dinner. [Stephanie] told her she could n't, because she had to care for her sick son, [William].
[{('Constance', 'nephew', 'William'): [('Constance', 'sister', 'Stephanie'), ('Stephanie', 'son', 'William')]}]