[Janet] invited her father [George] to her high school father daughter dance. [George]'s father [Clarence] is going to coach the team this year.
('Clarence', 'Janet')
[George]'s father [Clarence] is going to coach the team this year. [Janet] invited her father [George] to her high school father daughter dance.
[{('Clarence', 'granddaughter', 'Janet'): [('Clarence', 'son', 'George'), ('George', 'daughter', 'Janet')]}]
['son', 'daughter']