[Theresa] cooked dinner for her son [Tony] and her father [Clarence].
('Clarence', 'Tony')
[Theresa] cooked dinner for her son [Tony] and her father [Clarence].
[{('Clarence', 'grandson', 'Tony'): [('Clarence', 'daughter', 'Theresa'), ('Theresa', 'son', 'Tony')]}]
['daughter', 'son']