[Amy] and her son [Dennis] were waiting on his sister [Natalia] to come out of band practice.
('Amy', 'Natalia')
[Amy] and her son [Dennis] were waiting on his sister [Natalia] to come out of band practice.
[{('Amy', 'daughter', 'Natalia'): [('Amy', 'son', 'Dennis'), ('Dennis', 'sister', 'Natalia')]}]
['son', 'sister']