[Tracy] and her son [Bobby] went to the zoo with [Tracy]'s brother [Louis]. [Aaron] and his brother [Bobby] went to the park. They threw a ball around and played with their dog. [Marie] and her nephew [Aaron] went to the store to buy some new tea.
('Louis', 'Marie')
[Tracy] and her son [Bobby] went to the zoo with [Tracy]'s brother [Louis]. [Aaron] and his brother [Bobby] went to the park. They threw a ball around and played with their dog. [Marie] and her nephew [Aaron] went to the store to buy some new tea.
[{('Louis', 'sister', 'Marie'): [('Louis', 'sister', 'Tracy'), ('Tracy', 'sister', 'Marie')]}, {('Tracy', 'sister', 'Marie'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'aunt', 'Marie')]}, {('Tracy', 'son', 'Aaron'): [('Tracy', 'son', 'Bobby'), ('Bobby', 'brother', 'Aaron')]}]
['sister', 'son', 'brother', 'aunt']