[John]'s son, [Brent], loves going to the zoo with his grandmother [Mary].
('John', 'Mary')
[John]'s son, [Brent], loves going to the zoo with his grandmother [Mary].
[{('John', 'mother', 'Mary'): [('John', 'son', 'Brent'), ('Brent', 'grandmother', 'Mary')]}]