[Clarence] went to the park with his son [Dale], who brought along his daughter [Belva].
('Belva', 'Clarence')
[Clarence] went to the park with his son [Dale], who brought along his daughter [Belva].
[{('Belva', 'grandfather', 'Clarence'): [('Belva', 'father', 'Dale'), ('Dale', 'father', 'Clarence')]}]
['father', 'father']