[Ashley]'s son [Nicholas] and son [George] went to the park together to play.
('Nicholas', 'George')
[Ashley]'s son [Nicholas] and son [George] went to the park together to play.
[{('Nicholas', 'brother', 'George'): [('Nicholas', 'mother', 'Ashley'), ('Ashley', 'son', 'George')]}]
['mother', 'son']