[Ann]'s father [George] is home sick from work. [George]'s father [Clarence] is going to bring him some soup.
('Ann', 'Clarence')
[Ann]'s father [George] is home sick from work. [George]'s father [Clarence] is going to bring him some soup.
[{('Ann', 'grandfather', 'Clarence'): [('Ann', 'father', 'George'), ('George', 'father', 'Clarence')]}]
['father', 'father']