[George] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself. [George] loves cooking with his daughter. Her name is [Ann].
('Ann', 'Clarence')
[George] loves cooking with his daughter. Her name is [Ann]. [George] asked his father, [Clarence], to help him with his math homework. [Clarence] could n't, because he was lousy at math himself.
[{('Ann', 'grandfather', 'Clarence'): [('Ann', 'father', 'George'), ('George', 'father', 'Clarence')]}]
['father', 'father']