[Pete] went with his sister [Anna] to get groceries and [Anna]'s sister [Wilhelmina] went with them. [Cindy] took her son [Pete] shopping for new school clothes. They had a good time.
('Wilhelmina', 'Cindy')
[Pete] went with his sister [Anna] to get groceries and [Anna]'s sister [Wilhelmina] went with them. [Cindy] took her son [Pete] shopping for new school clothes. They had a good time.
[{('Wilhelmina', 'mother', 'Cindy'): [('Wilhelmina', 'sister', 'Anna'), ('Anna', 'mother', 'Cindy')]}, {('Anna', 'mother', 'Cindy'): [('Anna', 'brother', 'Pete'), ('Pete', 'mother', 'Cindy')]}]
['sister', 'brother', 'mother']