[Bret] and his sister [Deborah] sat and talked to [Melissa], [Bret]'s wife, about [Deborah]'s father [John].
('Melissa', 'John')
[Bret] and his sister [Deborah] sat and talked to [Melissa], [Bret]'s wife, about [Deborah]'s father [John].
[{('Melissa', 'father-in-law', 'John'): [('Melissa', 'husband', 'Bret'), ('Bret', 'father', 'John')]}, {('Bret', 'father', 'John'): [('Bret', 'sister', 'Deborah'), ('Deborah', 'father', 'John')]}]