[Pedro] went to pick up his daughter [Annie] from school on the last day before summer vacation. [Heather]'s sister [Cheryl] and father [Pedro] helped [Cheryl]'s sister, [Rebecca], move between apartments.
('Rebecca', 'Annie')
[Heather]'s sister [Cheryl] and father [Pedro] helped [Cheryl]'s sister, [Rebecca], move between apartments. [Pedro] went to pick up his daughter [Annie] from school on the last day before summer vacation.
[{('Rebecca', 'sister', 'Annie'): [('Rebecca', 'sister', 'Heather'), ('Heather', 'sister', 'Annie')]}, {('Heather', 'sister', 'Annie'): [('Heather', 'father', 'Pedro'), ('Pedro', 'daughter', 'Annie')]}, {('Rebecca', 'sister', 'Heather'): [('Rebecca', 'sister', 'Cheryl'), ('Cheryl', 'sister', 'Heather')]}]
['sister', 'sister', 'father', 'daughter']