[Dennis] and his brother [Milton] got into a fight over who was the better basketball player. [Amy] took her son [Milton] to the football game.
('Amy', 'Dennis')
[Amy] took her son [Milton] to the football game. [Dennis] and his brother [Milton] got into a fight over who was the better basketball player.
[{('Amy', 'son', 'Dennis'): [('Amy', 'son', 'Milton'), ('Milton', 'brother', 'Dennis')]}]
['son', 'brother']