[Theresa] baked a cake for her son [Tony]. [Theresa] is a woman with a sister named [Nancy].
('Nancy', 'Tony')
[Theresa] is a woman with a sister named [Nancy]. [Theresa] baked a cake for her son [Tony].
[{('Nancy', 'nephew', 'Tony'): [('Nancy', 'sister', 'Theresa'), ('Theresa', 'son', 'Tony')]}]
['sister', 'son']