[Tracy]'s son [Bobby] and brother [Robert] came to her birthday party last weekend. [Louis] and his uncle [Bobby] love to go hunting together. [Dorothy] went on a vacation with her brother [Robert].
('Dorothy', 'Louis')
[Dorothy] went on a vacation with her brother [Robert]. [Tracy]'s son [Bobby] and brother [Robert] came to her birthday party last weekend. [Louis] and his uncle [Bobby] love to go hunting together.
[{('Dorothy', 'brother', 'Louis'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'son', 'Bobby'), ('Bobby', 'uncle', 'Louis')]}, {('Dorothy', 'sister', 'Tracy'): [('Dorothy', 'brother', 'Robert'), ('Robert', 'sister', 'Tracy')]}]
['brother', 'sister', 'son', 'uncle']