[Aaron] asked his father, [Antonio], to help him with his math homework. [Antonio] could n't, because he was lousy at math himself. [Beverly] does n't like having to babysit her younger brother, [Robert]. [Robert] took his brother [Louis] to Las Vegas to go gambling. [Antonio] and his sister [Beverly] took their father out to eat for his birthday. They had a great time.
('Aaron', 'Louis')
[Aaron] asked his father, [Antonio], to help him with his math homework. [Antonio] could n't, because he was lousy at math himself. [Antonio] and his sister [Beverly] took their father out to eat for his birthday. They had a great time. [Beverly] does n't like having to babysit her younger brother, [Robert]. [Robert] took his brother [Louis] to Las Vegas to go gambling.
[{('Aaron', 'uncle', 'Louis'): [('Aaron', 'father', 'Antonio'), ('Antonio', 'brother', 'Louis')]}, {('Antonio', 'brother', 'Louis'): [('Antonio', 'brother', 'Robert'), ('Robert', 'brother', 'Louis')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'sister', 'Beverly'), ('Beverly', 'brother', 'Robert')]}]
['father', 'sister', 'brother', 'brother']