[Dale] and his sister [Nancy] stood in line at the fair. [Clarence] went hunting with his son, [Dale].
('Nancy', 'Clarence')
[Dale] and his sister [Nancy] stood in line at the fair. [Clarence] went hunting with his son, [Dale].
[{('Nancy', 'father', 'Clarence'): [('Nancy', 'brother', 'Dale'), ('Dale', 'father', 'Clarence')]}]
['brother', 'father']