[Wilhelmina] went to the store with her mother, [Cindy]. While they were in the fruit aisle, they ran into [Cindy]'s brother, [Hugh]. [Wilhelmina] was playing in the sandbox with her brother [Pete].
('Hugh', 'Pete')
[Wilhelmina] went to the store with her mother, [Cindy]. While they were in the fruit aisle, they ran into [Cindy]'s brother, [Hugh]. [Wilhelmina] was playing in the sandbox with her brother [Pete].
[{('Hugh', 'nephew', 'Pete'): [('Hugh', 'sister', 'Cindy'), ('Cindy', 'son', 'Pete')]}, {('Cindy', 'son', 'Pete'): [('Cindy', 'daughter', 'Wilhelmina'), ('Wilhelmina', 'brother', 'Pete')]}]
['sister', 'daughter', 'brother']