[Amy] took her son [Dennis] to the park for the afternoon. [Dennis] liked to play games with his sister, [Jennifer].
('Amy', 'Jennifer')
[Amy] took her son [Dennis] to the park for the afternoon. [Dennis] liked to play games with his sister, [Jennifer].
[{('Amy', 'daughter', 'Jennifer'): [('Amy', 'son', 'Dennis'), ('Dennis', 'sister', 'Jennifer')]}]
['son', 'sister']