[Tracy] gave her brother [Robert] a new sweater for Christmas. [Louis] was having a great dinner with his brother [Antonio]. [Dorothy], [Louis]'s sister, recommended the new Italian restaurant. [Tracy], [Dorothy]'s sister, declined the dinner invitation because she dislikes Italian food.
('Antonio', 'Robert')
[Louis] was having a great dinner with his brother [Antonio]. [Dorothy], [Louis]'s sister, recommended the new Italian restaurant. [Tracy], [Dorothy]'s sister, declined the dinner invitation because she dislikes Italian food. [Tracy] gave her brother [Robert] a new sweater for Christmas.
[{('Antonio', 'brother', 'Robert'): [('Antonio', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Robert')]}, {('Antonio', 'sister', 'Dorothy'): [('Antonio', 'brother', 'Louis'), ('Louis', 'sister', 'Dorothy')]}, {('Dorothy', 'brother', 'Robert'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Robert')]}]
['brother', 'sister', 'sister', 'brother']