[Wayne] 'son [Jeff] and [Jeff]'s grandfather [Clarence] went on a cruise together.
('Wayne', 'Clarence')
[Wayne] 'son [Jeff] and [Jeff]'s grandfather [Clarence] went on a cruise together.
[{('Wayne', 'father', 'Clarence'): [('Wayne', 'son', 'Jeff'), ('Jeff', 'grandfather', 'Clarence')]}]
['son', 'grandfather']