[Constance] was unhappy that her mother [Mary] did n't let her have a sleepover. But [Mary] let her son [John] spend the night out, which made [Constance] feel jealous.
('Constance', 'John')
[Constance] was unhappy that her mother [Mary] did n't let her have a sleepover. But [Mary] let her son [John] spend the night out, which made [Constance] feel jealous.
[{('Constance', 'brother', 'John'): [('Constance', 'mother', 'Mary'), ('Mary', 'son', 'John')]}]