[Clarence] thinks the world of his grandson [Michael]. [Michael]'s sister [Mary] asked him for some help planting her garden.
('Mary', 'Clarence')
[Michael]'s sister [Mary] asked him for some help planting her garden. [Clarence] thinks the world of his grandson [Michael].
[{('Mary', 'grandfather', 'Clarence'): [('Mary', 'brother', 'Michael'), ('Michael', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']