[Louis] took his son, [Samuel], to the library as his sister, [Dorothy], waited at home for her brother, [Robert]. [Samuel] is in the sixth grade. He looks up to his sister [Nettie], who is in the seventh.
('Robert', 'Nettie')
[Louis] took his son, [Samuel], to the library as his sister, [Dorothy], waited at home for her brother, [Robert]. [Samuel] is in the sixth grade. He looks up to his sister [Nettie], who is in the seventh.
[{('Robert', 'niece', 'Nettie'): [('Robert', 'brother', 'Louis'), ('Louis', 'daughter', 'Nettie')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Louis')]}, {('Louis', 'daughter', 'Nettie'): [('Louis', 'son', 'Samuel'), ('Samuel', 'sister', 'Nettie')]}]
['sister', 'brother', 'son', 'sister']