[George]'s son is [John]. [John] and his father always go fishing together on Sundays and have a great time together. [John]'s brother, [Douglas], brought the car over to help him.
('George', 'Douglas')
[George]'s son is [John]. [John] and his father always go fishing together on Sundays and have a great time together. [John]'s brother, [Douglas], brought the car over to help him.
[{('George', 'son', 'Douglas'): [('George', 'son', 'John'), ('John', 'brother', 'Douglas')]}]
['son', 'brother']