[Louis] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Paul] ate a salad. [Paul] went to pick up his uncle from the airport with his uncle's wife [Tracy]. [Dorothy] gave her brother [Louis] a new sweater for Christmas.
('Dorothy', 'Tracy')
[Dorothy] gave her brother [Louis] a new sweater for Christmas. [Louis] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Paul] ate a salad. [Paul] went to pick up his uncle from the airport with his uncle's wife [Tracy].
[{('Dorothy', 'sister', 'Tracy'): [('Dorothy', 'brother', 'Louis'), ('Louis', 'sister', 'Tracy')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'son', 'Paul'), ('Paul', 'aunt', 'Tracy')]}, {('Louis', 'son', 'Paul'): [('Louis', 'son', 'Wayne'), ('Wayne', 'brother', 'Paul')]}]
['brother', 'son', 'brother', 'aunt']