[Clarence] asked his granddaughter [Mary] to take him to a doctor's appointment. [Mary] asked her sister [Emily] to come along but she said she could n't make it.
('Clarence', 'Emily')
[Clarence] asked his granddaughter [Mary] to take him to a doctor's appointment. [Mary] asked her sister [Emily] to come along but she said she could n't make it.
[{('Clarence', 'granddaughter', 'Emily'): [('Clarence', 'granddaughter', 'Mary'), ('Mary', 'sister', 'Emily')]}]
['granddaughter', 'sister']