[Janet] asked her sister [April] to play with her. [April] did n't want to, she wanted to play with her sister [Andrea] instead.
('Janet', 'Andrea')
[Janet] asked her sister [April] to play with her. [April] did n't want to, she wanted to play with her sister [Andrea] instead.
[{('Janet', 'sister', 'Andrea'): [('Janet', 'sister', 'April'), ('April', 'sister', 'Andrea')]}]
['sister', 'sister']