[Aaron] and his uncle [Louis] are two of the best poker players in town. [Tracy] likes taking her son [Aaron] to school. [Robert] wanted to go to the park with his sister [Beverly]. [Beverly] said she'd rather go swimming with her sister [Tracy] instead.
('Robert', 'Louis')
[Robert] wanted to go to the park with his sister [Beverly]. [Beverly] said she'd rather go swimming with her sister [Tracy] instead. [Tracy] likes taking her son [Aaron] to school. [Aaron] and his uncle [Louis] are two of the best poker players in town.
[{('Robert', 'brother', 'Louis'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'uncle', 'Louis')]}, {('Robert', 'sister', 'Tracy'): [('Robert', 'sister', 'Beverly'), ('Beverly', 'sister', 'Tracy')]}]
['sister', 'sister', 'son', 'uncle']