[James] took his grandson [Thomas] to the zoo. [Thomas]'s brother [Don] went to the aquarium instead. [Don] liked to play games with his sister, [Andrea].
('James', 'Andrea')
[James] took his grandson [Thomas] to the zoo. [Thomas]'s brother [Don] went to the aquarium instead. [Don] liked to play games with his sister, [Andrea].
[{('James', 'granddaughter', 'Andrea'): [('James', 'grandson', 'Don'), ('Don', 'sister', 'Andrea')]}, {('James', 'grandson', 'Don'): [('James', 'grandson', 'Thomas'), ('Thomas', 'brother', 'Don')]}]
['grandson', 'brother', 'sister']