[Margaret] called her grandmother [Mary] on the phone. She just wanted to know how [Mary] was doing. [John] took his daughter, [Margaret], to the Cavaliers game on Saturday.
('John', 'Mary')
[John] took his daughter, [Margaret], to the Cavaliers game on Saturday. [Margaret] called her grandmother [Mary] on the phone. She just wanted to know how [Mary] was doing.
[{('John', 'mother', 'Mary'): [('John', 'daughter', 'Margaret'), ('Margaret', 'grandmother', 'Mary')]}]