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