[Robert] asked his mother [Nancy] to read to him. [Nancy] was too busy. [Amy]'s sister, [Nancy], recently started acting.
('Robert', 'Amy')
[Robert] asked his mother [Nancy] to read to him. [Nancy] was too busy. [Amy]'s sister, [Nancy], recently started acting.
[{('Robert', 'aunt', 'Amy'): [('Robert', 'mother', 'Nancy'), ('Nancy', 'sister', 'Amy')]}]
['mother', 'sister']