[Louis] took his father, [Harold], to a baseball game downtown. They invited [Wayne] along, because [Louis] is [Wayne]'s father. [Michael]'s brother, [Samuel] went sailing with his other brother, [Wayne].
('Michael', 'Harold')
[Michael]'s brother, [Samuel] went sailing with his other brother, [Wayne]. [Louis] took his father, [Harold], to a baseball game downtown. They invited [Wayne] along, because [Louis] is [Wayne]'s father.
[{('Michael', 'grandfather', 'Harold'): [('Michael', 'brother', 'Wayne'), ('Wayne', 'grandfather', 'Harold')]}, {('Michael', 'brother', 'Wayne'): [('Michael', 'brother', 'Samuel'), ('Samuel', 'brother', 'Wayne')]}, {('Wayne', 'grandfather', 'Harold'): [('Wayne', 'father', 'Louis'), ('Louis', 'father', 'Harold')]}]
['brother', 'brother', 'father', 'father']