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