[Heidi] asked her sister [Lorraine] to hurry up and get off the phone. [Heidi]'s sister [Louise] told her to wait her turn and be more patient.
('Lorraine', 'Louise')
[Heidi] asked her sister [Lorraine] to hurry up and get off the phone. [Heidi]'s sister [Louise] told her to wait her turn and be more patient.
[{('Lorraine', 'sister', 'Louise'): [('Lorraine', 'sister', 'Heidi'), ('Heidi', 'sister', 'Louise')]}]
['sister', 'sister']