[Dale]'s son, [Tony], and his mother, [Ashley], spent a nice day at the river looking for pretty rocks.
('Tony', 'Ashley')
[Dale]'s son, [Tony], and his mother, [Ashley], spent a nice day at the river looking for pretty rocks.
[{('Tony', 'grandmother', 'Ashley'): [('Tony', 'father', 'Dale'), ('Dale', 'mother', 'Ashley')]}]
['father', 'mother']