[Amy] took her son [Dennis] on a trip. They went to see [Amy]'s mother, [Ashley].
('Dennis', 'Ashley')
[Amy] took her son [Dennis] on a trip. They went to see [Amy]'s mother, [Ashley].
[{('Dennis', 'grandmother', 'Ashley'): [('Dennis', 'mother', 'Amy'), ('Amy', 'mother', 'Ashley')]}]
['mother', 'mother']