[Douglas] asked his mother [Lillian] if she could read him a story. She was busy, but [Ashley], [Lillian]'s mother, was able to read to [Douglas] instead.
('Douglas', 'Ashley')
[Douglas] asked his mother [Lillian] if she could read him a story. She was busy, but [Ashley], [Lillian]'s mother, was able to read to [Douglas] instead.
[{('Douglas', 'grandmother', 'Ashley'): [('Douglas', 'mother', 'Lillian'), ('Lillian', 'mother', 'Ashley')]}]
['mother', 'mother']