[Jeff] and his father [Wayne] played video games all day last Saturday. [Wayne] went to the park with his father, [Clarence].
('Jeff', 'Clarence')
[Jeff] and his father [Wayne] played video games all day last Saturday. [Wayne] went to the park with his father, [Clarence].
[{('Jeff', 'grandfather', 'Clarence'): [('Jeff', 'father', 'Wayne'), ('Wayne', 'father', 'Clarence')]}]
['father', 'father']