[Rosetta] and her sister [June] played golf together. [Rosetta] won easily. [June] called [Charlotte], her sister, to see if she wanted to go out to eat.
('Charlotte', 'Rosetta')
[June] called [Charlotte], her sister, to see if she wanted to go out to eat. [Rosetta] and her sister [June] played golf together. [Rosetta] won easily.
[{('Charlotte', 'sister', 'Rosetta'): [('Charlotte', 'sister', 'June'), ('June', 'sister', 'Rosetta')]}]
['sister', 'sister']