[Renee] went grocery shopping with her mother, [Martha]. [Martha]'s father [Roy] asked them to pick up milk for him.
('Renee', 'Roy')
[Renee] went grocery shopping with her mother, [Martha]. [Martha]'s father [Roy] asked them to pick up milk for him.
[{('Renee', 'grandfather', 'Roy'): [('Renee', 'mother', 'Martha'), ('Martha', 'father', 'Roy')]}]