[Jeff]'s brother, [Robert], brought the car over to help him. [Robert] asked his father, [Wayne], to help him with his math homework. [Wayne] could n't, because he was lousy at math himself.
('Jeff', 'Wayne')
[Jeff]'s brother, [Robert], brought the car over to help him. [Robert] 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', 'Robert'), ('Robert', 'father', 'Wayne')]}]
['brother', 'father']