[Ashley] invited her son [George] to dinner, but not his wife [Lillian].
('Ashley', 'Lillian')
[Ashley] invited her son [George] to dinner, but not his wife [Lillian].
[{('Ashley', 'daughter-in-law', 'Lillian'): [('Ashley', 'son', 'George'), ('George', 'wife', 'Lillian')]}]
['son', 'wife']