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