[Pedro] needed his brother, [Louis], to help with a problem [Dorothy] was playing in the sandbox with her brother [Robert]. [Robert] is taking his daughter [Lizzie] out for lunch at her favorite restaurant. [Pedro] went his brother to pick up his brother's daughter [Lizzie] from a birthday party.
('Dorothy', 'Louis')
[Dorothy] was playing in the sandbox with her brother [Robert]. [Robert] is taking his daughter [Lizzie] out for lunch at her favorite restaurant. [Pedro] went his brother to pick up his brother's daughter [Lizzie] from a birthday party. [Pedro] needed his brother, [Louis], to help with a problem
[{('Dorothy', 'brother', 'Louis'): [('Dorothy', 'brother', 'Robert'), ('Robert', 'brother', 'Louis')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'brother', 'Louis')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'daughter', 'Lizzie'), ('Lizzie', 'uncle', 'Pedro')]}]
['brother', 'daughter', 'uncle', 'brother']