[Mary] picked her sister, [Natalia], up from the mall. [Natalia] called her dad, [Nicholas], when she got home to let him know where she was.
('Nicholas', 'Mary')
[Mary] picked her sister, [Natalia], up from the mall. [Natalia] called her dad, [Nicholas], when she got home to let him know where she was.
[{('Nicholas', 'daughter', 'Mary'): [('Nicholas', 'daughter', 'Natalia'), ('Natalia', 'sister', 'Mary')]}]
['daughter', 'sister']