[George]'s son, [Douglas], went to the candy store. [Douglas]'s brother, [John], went with him.
('George', 'John')
[George]'s son, [Douglas], went to the candy store. [Douglas]'s brother, [John], went with him.
[{('George', 'son', 'John'): [('George', 'son', 'Douglas'), ('Douglas', 'brother', 'John')]}]
['son', 'brother']