[Jeffrey] loves his mother [Dorothy] very much. [Harold]'s daughter [Tracy] is a professional tennis player. [Tracy]'s brother [Dorothy] is her manager. [Harold] went to pick up his son [Louis] from the baseball practice.
('Jeffrey', 'Louis')
[Jeffrey] loves his mother [Dorothy] very much. [Harold]'s daughter [Tracy] is a professional tennis player. [Tracy]'s brother [Dorothy] is her manager. [Harold] went to pick up his son [Louis] from the baseball practice.
[{('Jeffrey', 'uncle', 'Louis'): [('Jeffrey', 'mother', 'Dorothy'), ('Dorothy', 'brother', 'Louis')]}, {('Dorothy', 'brother', 'Louis'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'father', 'Harold'), ('Harold', 'son', 'Louis')]}]
['mother', 'sister', 'father', 'son']