[Carl] took his grandmother [Mary] to the dog track. [Carl] went to the grocery store for his brother [Michael], because he broke his leg.
('Michael', 'Mary')
[Carl] went to the grocery store for his brother [Michael], because he broke his leg. [Carl] took his grandmother [Mary] to the dog track.
[{('Michael', 'grandmother', 'Mary'): [('Michael', 'brother', 'Carl'), ('Carl', 'grandmother', 'Mary')]}]