[George] took his daughter [Ann] to school this morning and then stopped by to visit his father [Clarence].
('Ann', 'Clarence')
[George] took his daughter [Ann] to school this morning and then stopped by to visit his father [Clarence].
[{('Ann', 'grandfather', 'Clarence'): [('Ann', 'father', 'George'), ('George', 'father', 'Clarence')]}]
['father', 'father']