[Dennis] and his brother [Michael] wanted to go to the arcade. [Michael] asked his mother, [Amy], if they could, and she said yes.
('Dennis', 'Amy')
[Dennis] and his brother [Michael] wanted to go to the arcade. [Michael] asked his mother, [Amy], if they could, and she said yes.
[{('Dennis', 'mother', 'Amy'): [('Dennis', 'brother', 'Michael'), ('Michael', 'mother', 'Amy')]}]
['brother', 'mother']