[Jennifer]'s father, [Nicholas], was so proud to see her graduate. [Nicholas]'s father, [Clarence], was glad to see him so happy.
('Jennifer', 'Clarence')
[Jennifer]'s father, [Nicholas], was so proud to see her graduate. [Nicholas]'s father, [Clarence], was glad to see him so happy.
[{('Jennifer', 'grandfather', 'Clarence'): [('Jennifer', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']