[Martha] took her daughter [Laura] to see her very first ballet performance. [Mary] picked up her daughter [Martha] from school early.
('Laura', 'Mary')
[Martha] took her daughter [Laura] to see her very first ballet performance. [Mary] picked up her daughter [Martha] from school early.
[{('Laura', 'grandmother', 'Mary'): [('Laura', 'mother', 'Martha'), ('Martha', 'mother', 'Mary')]}]