[Louis] went to the ball game with his brothers [Robert] and [Pedro]. [Tracy] was thrilled for her brother, [Robert], and his new job. [Tracy] could n't wait to tell her mother, [Emma].
('Emma', 'Pedro')
[Tracy] was thrilled for her brother, [Robert], and his new job. [Tracy] could n't wait to tell her mother, [Emma]. [Louis] went to the ball game with his brothers [Robert] and [Pedro].
[{('Emma', 'uncle', 'Pedro'): [('Emma', 'mother', 'Tracy'), ('Tracy', 'brother', 'Pedro')]}, {('Tracy', 'brother', 'Pedro'): [('Tracy', 'brother', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'brother', 'Louis'), ('Louis', 'brother', 'Pedro')]}]
['mother', 'brother', 'brother', 'brother']