[Dorothy] invited her nephew, [Wayne], over for dinner. [Tracy]'s brothers, [Robert] and [Louis], took [Louis]'s son [Wayne] to the football game.
('Robert', 'Dorothy')
[Tracy]'s brothers, [Robert] and [Louis], took [Louis]'s son [Wayne] to the football game. [Dorothy] invited her nephew, [Wayne], over for dinner.
[{('Robert', 'sister', 'Dorothy'): [('Robert', 'brother', 'Louis'), ('Louis', 'sister', 'Dorothy')]}, {('Louis', 'sister', 'Dorothy'): [('Louis', 'son', 'Wayne'), ('Wayne', 'aunt', 'Dorothy')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}]
['sister', 'brother', 'son', 'aunt']