[Lorraine] went to the store with her sister [Louise]. Later that day, [Lorraine] had tea with her sister [Linda].
('Linda', 'Louise')
[Lorraine] went to the store with her sister [Louise]. Later that day, [Lorraine] had tea with her sister [Linda].
[{('Linda', 'sister', 'Louise'): [('Linda', 'sister', 'Lorraine'), ('Lorraine', 'sister', 'Louise')]}]
['sister', 'sister']