[Timmy]'s grandfather [Roy] took him and his sister [Geraldine] to the beach to play in the tide pools.
('Geraldine', 'Roy')
[Timmy]'s grandfather [Roy] took him and his sister [Geraldine] to the beach to play in the tide pools.
[{('Geraldine', 'grandfather', 'Roy'): [('Geraldine', 'brother', 'Timmy'), ('Timmy', 'grandfather', 'Roy')]}]