[Charles] brought home straight A's to his father [Wesley]. [Chris] brought home straight C's to his father [Wesley]. [Charles] visited his aunt [David].
('Chris', 'David')
[Charles] brought home straight A's to his father [Wesley]. [Chris] brought home straight C's to his father [Wesley]. [Charles] visited his aunt [David].
[{('Chris', 'aunt', 'David'): [('Chris', 'father', 'Wesley'), ('Wesley', 'sister', 'David')]}, {('Wesley', 'sister', 'David'): [('Wesley', 'son', 'Charles'), ('Charles', 'aunt', 'David')]}]
['father', 'son', 'aunt']