[John] asked his father, [George] to help him build a birdhouse. [Dale] went with his nephew, [John], to the comic book store.
('George', 'Dale')
[John] asked his father, [George] to help him build a birdhouse. [Dale] went with his nephew, [John], to the comic book store.
[{('George', 'brother', 'Dale'): [('George', 'son', 'John'), ('John', 'uncle', 'Dale')]}]
['son', 'uncle']