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