[Amy] and her daughter [Mary] went to visit [Amy]'s mother [Ashley] last Sunday.
('Mary', 'Ashley')
[Amy] and her daughter [Mary] went to visit [Amy]'s mother [Ashley] last Sunday.
[{('Mary', 'grandmother', 'Ashley'): [('Mary', 'mother', 'Amy'), ('Amy', 'mother', 'Ashley')]}]
['mother', 'mother']