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