[Cindy] took her son [Wayne] to the park for the afternoon. [Cindy] was sewing a sweater for her sister [Lena]. [Lena] was sewing a sweater for her sister [Lynn].
('Lynn', 'Wayne')
[Lena] was sewing a sweater for her sister [Lynn]. [Cindy] was sewing a sweater for her sister [Lena]. [Cindy] took her son [Wayne] to the park for the afternoon.
[{('Lynn', 'nephew', 'Wayne'): [('Lynn', 'sister', 'Cindy'), ('Cindy', 'son', 'Wayne')]}, {('Lynn', 'sister', 'Cindy'): [('Lynn', 'sister', 'Lena'), ('Lena', 'sister', 'Cindy')]}]
['sister', 'sister', 'son']