[Stephanie]'s mother [Mary] went to pick up [Alberta]. [Alberta]'s mother, [Stephanie], could n't be there to pick up [Alberta].
('Alberta', 'Mary')
[Stephanie]'s mother [Mary] went to pick up [Alberta]. [Alberta]'s mother, [Stephanie], could n't be there to pick up [Alberta].
[{('Alberta', 'grandmother', 'Mary'): [('Alberta', 'mother', 'Stephanie'), ('Stephanie', 'mother', 'Mary')]}]