[Michael] gave his mother [Beverly] flowers on her birthday. [Marie] and her sister [Dorothy] are the only children in their family. [Tracy] was playing hide-and-seek with her sister [Dorothy]. [Beverly] is taking a trip to see her sister [Tracy].
('Michael', 'Marie')
[Michael] gave his mother [Beverly] flowers on her birthday. [Beverly] is taking a trip to see her sister [Tracy]. [Tracy] was playing hide-and-seek with her sister [Dorothy]. [Marie] and her sister [Dorothy] are the only children in their family.
[{('Michael', 'aunt', 'Marie'): [('Michael', 'mother', 'Beverly'), ('Beverly', 'sister', 'Marie')]}, {('Beverly', 'sister', 'Marie'): [('Beverly', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Marie')]}, {('Beverly', 'sister', 'Dorothy'): [('Beverly', 'sister', 'Tracy'), ('Tracy', 'sister', 'Dorothy')]}]
['mother', 'sister', 'sister', 'sister']