[James] and his son [Hugh] went to the park to look for different kinds of birds. [Cindy] brought her son [Pete] and her father [James] with her to the local swap-meet to hunt for nice antiques.
('Hugh', 'Pete')
[James] and his son [Hugh] went to the park to look for different kinds of birds. [Cindy] brought her son [Pete] and her father [James] with her to the local swap-meet to hunt for nice antiques.
[{('Hugh', 'nephew', 'Pete'): [('Hugh', 'sister', 'Cindy'), ('Cindy', 'son', 'Pete')]}, {('Hugh', 'sister', 'Cindy'): [('Hugh', 'father', 'James'), ('James', 'daughter', 'Cindy')]}]
['father', 'daughter', 'son']