[Mary] sent her grandson [Timmy] a birthday card. [Roy] hugged his wife, [Mary].
('Roy', 'Timmy')
[Mary] sent her grandson [Timmy] a birthday card. [Roy] hugged his wife, [Mary].
[{('Roy', 'grandson', 'Timmy'): [('Roy', 'wife', 'Mary'), ('Mary', 'grandson', 'Timmy')]}]