[Theresa]'s son [Nicolas] loves all of his grandparents; but [Nicolas]'s favorite grandparent is [Clarence].
('Theresa', 'Clarence')
[Theresa]'s son [Nicolas] loves all of his grandparents; but [Nicolas]'s favorite grandparent is [Clarence].
[{('Theresa', 'father', 'Clarence'): [('Theresa', 'son', 'Nicolas'), ('Nicolas', 'grandfather', 'Clarence')]}]
['son', 'grandfather']