[Roy] took his grandson [Thomas] to the zoo. [Thomas]'s brother [Newton] went to the aquarium instead.
('Roy', 'Newton')
[Roy] took his grandson [Thomas] to the zoo. [Thomas]'s brother [Newton] went to the aquarium instead.
[{('Roy', 'grandson', 'Newton'): [('Roy', 'grandson', 'Thomas'), ('Thomas', 'brother', 'Newton')]}]