[Ernest] 'son [Thomas] and [Thomas]'s grandfather [Roy] went on a cruise together.
('Ernest', 'Roy')
[Ernest] 'son [Thomas] and [Thomas]'s grandfather [Roy] went on a cruise together.
[{('Ernest', 'father', 'Roy'): [('Ernest', 'son', 'Thomas'), ('Thomas', 'grandfather', 'Roy')]}]