[Dale] met with his mother, [Ashley] and his son [Tony], for afternoon tea.
('Ashley', 'Tony')
[Dale] met with his mother, [Ashley] and his son [Tony], for afternoon tea.
[{('Ashley', 'grandson', 'Tony'): [('Ashley', 'son', 'Dale'), ('Dale', 'son', 'Tony')]}]
['son', 'son']