[Roy] gave his wife [Mary] flowers for her birthday. [Mary]'s grandson [Danny] surprised her with a party.
('Roy', 'Danny')
[Roy] gave his wife [Mary] flowers for her birthday. [Mary]'s grandson [Danny] surprised her with a party.
[{('Roy', 'grandson', 'Danny'): [('Roy', 'wife', 'Mary'), ('Mary', 'grandson', 'Danny')]}]