[Robert] did n't get along very well with his sister [Tracy] for some reason. [Antonio] and his sister [Dorothy] went to brunch today at the new diner. [Dorothy] needed to go to the store. [Dorothy] asked her sister [Tracy] for a ride. [Antonio] bought his sister [Beverly] a video game for her birthday. She said it was her favorite game and gave him a big hug.
('Robert', 'Beverly')
[Robert] did n't get along very well with his sister [Tracy] for some reason. [Dorothy] needed to go to the store. [Dorothy] asked her sister [Tracy] for a ride. [Antonio] and his sister [Dorothy] went to brunch today at the new diner. [Antonio] bought his sister [Beverly] a video game for her birthday. She said it was her favorite game and gave him a big hug.
[{('Robert', 'sister', 'Beverly'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'sister', 'Beverly')]}, {('Tracy', 'sister', 'Beverly'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}, {('Dorothy', 'sister', 'Beverly'): [('Dorothy', 'brother', 'Antonio'), ('Antonio', 'sister', 'Beverly')]}]
['sister', 'sister', 'brother', 'sister']