[Nicholas] is in the sixth grade. He looks up to his sister [Lillian], who is in the seventh. [Lillian] and her son [John] went to the zoo and then out to dinner yesterday.
('Nicholas', 'John')
[Nicholas] is in the sixth grade. He looks up to his sister [Lillian], who is in the seventh. [Lillian] and her son [John] went to the zoo and then out to dinner yesterday.
[{('Nicholas', 'nephew', 'John'): [('Nicholas', 'sister', 'Lillian'), ('Lillian', 'son', 'John')]}]
['sister', 'son']