[Aaron] invited his uncle [Pedro] to dinner [Louis] is the great brother of [Pedro]. [Harold]'s daughter, [Tracy], is having some trouble. Her son, [Aaron], is n't doing well in school.
('Harold', 'Louis')
[Harold]'s daughter, [Tracy], is having some trouble. Her son, [Aaron], is n't doing well in school. [Aaron] invited his uncle [Pedro] to dinner [Louis] is the great brother of [Pedro].
[{('Harold', 'son', 'Louis'): [('Harold', 'daughter', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'brother', 'Pedro'), ('Pedro', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Pedro'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'uncle', 'Pedro')]}]
['daughter', 'son', 'uncle', 'brother']