[Jennifer] and her father [Nicholas] like to spend the holidays together. [Nicholas] will often invite his father [Clarence] to join them.
('Jennifer', 'Clarence')
[Jennifer] and her father [Nicholas] like to spend the holidays together. [Nicholas] will often invite his father [Clarence] to join them.
[{('Jennifer', 'grandfather', 'Clarence'): [('Jennifer', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']