[Clarence] is taking is son [Wayne] out for a weekend camping trip. [Wayne]'s son [Jeff] is sick and can not go.
('Jeff', 'Clarence')
[Clarence] is taking is son [Wayne] out for a weekend camping trip. [Wayne]'s son [Jeff] is sick and can not go.
[{('Jeff', 'grandfather', 'Clarence'): [('Jeff', 'father', 'Wayne'), ('Wayne', 'father', 'Clarence')]}]
['father', 'father']