[Gladys] and her brother [Timmy] went to visit [Mary]'s grandmother, [Gladys].
('Timmy', 'Mary')
[Gladys] and her brother [Timmy] went to visit [Mary]'s grandmother, [Gladys].
[{('Timmy', 'grandmother', 'Mary'): [('Timmy', 'sister', 'Gladys'), ('Gladys', 'grandmother', 'Mary')]}]