[Theresa]'s son, [Nicolas], came over to her house for dinner. [James], [Nicolas]'s brother, came too.
('Theresa', 'James')
[Theresa]'s son, [Nicolas], came over to her house for dinner. [James], [Nicolas]'s brother, came too.
[{('Theresa', 'son', 'James'): [('Theresa', 'son', 'Nicolas'), ('Nicolas', 'brother', 'James')]}]
['son', 'brother']