[Dale] got coffee for his wife [Theresa] and his father [Clarence].
('Theresa', 'Clarence')
[Dale] got coffee for his wife [Theresa] and his father [Clarence].
[{('Theresa', 'father-in-law', 'Clarence'): [('Theresa', 'husband', 'Dale'), ('Dale', 'father', 'Clarence')]}]
['husband', 'father']