[Mary] played catch with her grandson [Franklin]. [Franklin]'s father [John] was busy at work and could n't join them.
('John', 'Mary')
[Mary] played catch with her grandson [Franklin]. [Franklin]'s father [John] was busy at work and could n't join them.
[{('John', 'mother', 'Mary'): [('John', 'son', 'Franklin'), ('Franklin', 'grandmother', 'Mary')]}]