[Harold] went to pick up his son [Antonio] from the baseball practice. [Antonio] bought his daughter, [Bettie], flowers. [Tracy] went shopping with her daughter, [Bettie]. [Tracy] also invited her sister, [Marie], along.
('Harold', 'Marie')
[Harold] went to pick up his son [Antonio] from the baseball practice. [Antonio] bought his daughter, [Bettie], flowers. [Tracy] went shopping with her daughter, [Bettie]. [Tracy] also invited her sister, [Marie], along.
[{('Harold', 'daughter', 'Marie'): [('Harold', 'son', 'Antonio'), ('Antonio', 'sister', 'Marie')]}, {('Antonio', 'sister', 'Marie'): [('Antonio', 'daughter', 'Bettie'), ('Bettie', 'aunt', 'Marie')]}, {('Bettie', 'aunt', 'Marie'): [('Bettie', 'mother', 'Tracy'), ('Tracy', 'sister', 'Marie')]}]
['son', 'daughter', 'mother', 'sister']