[Dorothy] went to the arcade with her niece, [Michelle]. They had lots of fun playing together. [Marie] and her sister [Tracy] were at the library studying. [Michelle], [Marie]'s daughter, started laughing, and [Michelle] told her to be quiet. [Beverly] and her sister [Dorothy] played golf together. [Beverly] won easily.
('Tracy', 'Beverly')
[Marie] and her sister [Tracy] were at the library studying. [Michelle], [Marie]'s daughter, started laughing, and [Michelle] told her to be quiet. [Dorothy] went to the arcade with her niece, [Michelle]. They had lots of fun playing together. [Beverly] and her sister [Dorothy] played golf together. [Beverly] won easily.
[{('Tracy', 'sister', 'Beverly'): [('Tracy', 'sister', 'Marie'), ('Marie', 'sister', 'Beverly')]}, {('Marie', 'sister', 'Beverly'): [('Marie', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}, {('Marie', 'sister', 'Dorothy'): [('Marie', 'daughter', 'Michelle'), ('Michelle', 'aunt', 'Dorothy')]}]
['sister', 'daughter', 'aunt', 'sister']