[Mary] bought opera tickets as a surprise for her husband [Roy]. [Roy]'s grandson, [Guy], wanted to go too.
('Mary', 'Guy')
[Mary] bought opera tickets as a surprise for her husband [Roy]. [Roy]'s grandson, [Guy], wanted to go too.
[{('Mary', 'grandson', 'Guy'): [('Mary', 'husband', 'Roy'), ('Roy', 'grandson', 'Guy')]}]