[Mary] picked up her daughter [Constance] from school early. [Mary] drove her son [John] to his soccer game.
('Constance', 'John')
[Mary] picked up her daughter [Constance] from school early. [Mary] drove her son [John] to his soccer game.
[{('Constance', 'brother', 'John'): [('Constance', 'mother', 'Mary'), ('Mary', 'son', 'John')]}]