[Clarence] helped his grandson [Michael] cut the lawn for [Michael]'s mother, [Amy].
('Amy', 'Clarence')
[Clarence] helped his grandson [Michael] cut the lawn for [Michael]'s mother, [Amy].
[{('Amy', 'father', 'Clarence'): [('Amy', 'son', 'Michael'), ('Michael', 'grandfather', 'Clarence')]}]
['son', 'grandfather']