[Harold] took his son [Robert] to soccer practice. [Pedro] bought a book for his father [Harold]. [Harold] went shopping with his wife [Shantel]. [Robert] asked his father, [Harold], to help him with his math homework. [Harold] could n't, because he was lousy at math himself.
('Shantel', 'Pedro')
[Harold] went shopping with his wife [Shantel]. [Harold] took his son [Robert] to soccer practice. [Robert] asked his father, [Harold], to help him with his math homework. [Harold] could n't, because he was lousy at math himself. [Pedro] bought a book for his father [Harold].
[{('Shantel', 'son', 'Pedro'): [('Shantel', 'son', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'father', 'Harold'), ('Harold', 'son', 'Pedro')]}, {('Shantel', 'son', 'Robert'): [('Shantel', 'husband', 'Harold'), ('Harold', 'son', 'Robert')]}]
['husband', 'son', 'father', 'son']