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