[Clarence]'s grandson [Dennis] and [Dennis]'s brother [Michael] all went to get pizza last night.
('Michael', 'Clarence')
[Clarence]'s grandson [Dennis] and [Dennis]'s brother [Michael] all went to get pizza last night.
[{('Michael', 'grandfather', 'Clarence'): [('Michael', 'brother', 'Dennis'), ('Dennis', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']