[Roy] took his son [John] out to eat after [John]'s daughter, [Ann], cancelled.
('Roy', 'Ann')
[Roy] took his son [John] out to eat after [John]'s daughter, [Ann], cancelled.
[{('Roy', 'granddaughter', 'Ann'): [('Roy', 'son', 'John'), ('John', 'daughter', 'Ann')]}]