[George] needed his brother, [Wayne], to help with a problem [Wayne] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself.
('George', 'Clarence')
[George] needed his brother, [Wayne], to help with a problem [Wayne] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself.
[{('George', 'father', 'Clarence'): [('George', 'brother', 'Wayne'), ('Wayne', 'father', 'Clarence')]}]
['brother', 'father']