[Clarence] asked his son, [Dale], to go grocery shopping for him. [Dale] was busy and sent his wife, [Theresa], instead.
('Clarence', 'Theresa')
[Clarence] asked his son, [Dale], to go grocery shopping for him. [Dale] was busy and sent his wife, [Theresa], instead.
[{('Clarence', 'daughter-in-law', 'Theresa'): [('Clarence', 'son', 'Dale'), ('Dale', 'wife', 'Theresa')]}]
['son', 'wife']