[James] and his son [Hugh] went to the park to look for different kinds of birds. [James] took his son [Wesley] out to dinner to celebrate his promotion. [Wesley] brought his son, [Chris], along to celebrate.
('Hugh', 'Chris')
[James] and his son [Hugh] went to the park to look for different kinds of birds. [James] took his son [Wesley] out to dinner to celebrate his promotion. [Wesley] brought his son, [Chris], along to celebrate.
[{('Hugh', 'nephew', 'Chris'): [('Hugh', 'brother', 'Wesley'), ('Wesley', 'son', 'Chris')]}, {('Hugh', 'brother', 'Wesley'): [('Hugh', 'father', 'James'), ('James', 'son', 'Wesley')]}]
['father', 'son', 'son']