[George] and his daughter [Ann] went with her grandfather [Clarence] to the bowling alley.
('George', 'Clarence')
[George] and his daughter [Ann] went with her grandfather [Clarence] to the bowling alley.
[{('George', 'father', 'Clarence'): [('George', 'daughter', 'Ann'), ('Ann', 'grandfather', 'Clarence')]}]
['daughter', 'grandfather']