[Nicholas] went to the park with his mother, [Ashley], and his son, [Glen].
('Ashley', 'Glen')
[Nicholas] went to the park with his mother, [Ashley], and his son, [Glen].
[{('Ashley', 'grandson', 'Glen'): [('Ashley', 'son', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['son', 'son']