[Ashley] cooked her son [Dale] his favorite meal yesterday because it was his birthday. [Dale] bought a book for his son [Tony].
('Tony', 'Ashley')
[Dale] bought a book for his son [Tony]. [Ashley] cooked her son [Dale] his favorite meal yesterday because it was his birthday.
[{('Tony', 'grandmother', 'Ashley'): [('Tony', 'father', 'Dale'), ('Dale', 'mother', 'Ashley')]}]
['father', 'mother']