[April] is a woman with a sister named [Ann]. [Ann] needed to go to the store. [Ann] asked her sister [Janet] for a ride.
('Janet', 'April')
[Ann] needed to go to the store. [Ann] asked her sister [Janet] for a ride. [April] is a woman with a sister named [Ann].
[{('Janet', 'sister', 'April'): [('Janet', 'sister', 'Ann'), ('Ann', 'sister', 'April')]}]
['sister', 'sister']