[Douglas] and his son [George] are going to eat lunch with [Ashley], [Douglas]'s grandmother.
('George', 'Ashley')
[Douglas] and his son [George] are going to eat lunch with [Ashley], [Douglas]'s grandmother.
[{('George', 'mother', 'Ashley'): [('George', 'son', 'Douglas'), ('Douglas', 'grandmother', 'Ashley')]}]
['son', 'grandmother']