[John] bought a book for his son [Allan]. [Bret] likes playing catch with his sister [Deborah], but his brother [Allan] never wants to play.
('Deborah', 'John')
[Bret] likes playing catch with his sister [Deborah], but his brother [Allan] never wants to play. [John] bought a book for his son [Allan].
[{('Deborah', 'father', 'John'): [('Deborah', 'brother', 'Bret'), ('Bret', 'father', 'John')]}, {('Bret', 'father', 'John'): [('Bret', 'brother', 'Allan'), ('Allan', 'father', 'John')]}]