[Harold] took his daughter [Tracy] to softball practie. [Harold] took his son [Louis] to school this morning because he missed the bus. [Robert] bought his daughter, [Angelica], flowers. [Angelica] did n't enjoy spending time with her aunt [Tracy].
('Robert', 'Louis')
[Robert] bought his daughter, [Angelica], flowers. [Angelica] did n't enjoy spending time with her aunt [Tracy]. [Harold] took his daughter [Tracy] to softball practie. [Harold] took his son [Louis] to school this morning because he missed the bus.
[{('Robert', 'brother', 'Louis'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Robert', 'sister', 'Tracy'): [('Robert', 'daughter', 'Angelica'), ('Angelica', 'aunt', 'Tracy')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'father', 'Harold'), ('Harold', 'son', 'Louis')]}]
['daughter', 'aunt', 'father', 'son']