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