[Beverly]'s son, [Samuel], was busy with school activities and forgot to meet his sister. [Samuel] went to a piano concert with his aunt [Marie]. [Marie] is taking a trip to see her sister [Dorothy]. [Tracy] is getting married. She is looking forward to her sister, [Beverly], attending. They have n't seen each other since [Beverly] relocated to California with her husband 3 years ago.
('Tracy', 'Dorothy')
[Tracy] is getting married. She is looking forward to her sister, [Beverly], attending. They have n't seen each other since [Beverly] relocated to California with her husband 3 years ago. [Beverly]'s son, [Samuel], was busy with school activities and forgot to meet his sister. [Samuel] went to a piano concert with his aunt [Marie]. [Marie] is taking a trip to see her sister [Dorothy].
[{('Tracy', 'sister', 'Dorothy'): [('Tracy', 'sister', 'Marie'), ('Marie', 'sister', 'Dorothy')]}, {('Tracy', 'sister', 'Marie'): [('Tracy', 'sister', 'Beverly'), ('Beverly', 'sister', 'Marie')]}, {('Beverly', 'sister', 'Marie'): [('Beverly', 'son', 'Samuel'), ('Samuel', 'aunt', 'Marie')]}]
['sister', 'son', 'aunt', 'sister']