[Linda] bought some shoes for her father [Wayne]. [Wayne] and his father [Clarence] played video games all day last Saturday.
('Linda', 'Clarence')
[Linda] bought some shoes for her father [Wayne]. [Wayne] and his father [Clarence] played video games all day last Saturday.
[{('Linda', 'grandfather', 'Clarence'): [('Linda', 'father', 'Wayne'), ('Wayne', 'father', 'Clarence')]}]
['father', 'father']