[Jacob] asked his father, [Wayne], to help him with his math homework. [Wayne] could n't, because he was lousy at math himself. [Jacob] went to the grocery store for his brother [Jeff], because he broke his leg.
('Jeff', 'Wayne')
[Jacob] went to the grocery store for his brother [Jeff], because he broke his leg. [Jacob] asked his father, [Wayne], to help him with his math homework. [Wayne] could n't, because he was lousy at math himself.
[{('Jeff', 'father', 'Wayne'): [('Jeff', 'brother', 'Jacob'), ('Jacob', 'father', 'Wayne')]}]
['brother', 'father']