[Pedro] taught his daughter, [Annie], how to ride a bike. [Cheryl] and her sister [Heather] took their grandmother [Shantel] to the theme park with [Cheryl]'s father [Pedro].
('Annie', 'Shantel')
[Pedro] taught his daughter, [Annie], how to ride a bike. [Cheryl] and her sister [Heather] took their grandmother [Shantel] to the theme park with [Cheryl]'s father [Pedro].
[{('Annie', 'grandmother', 'Shantel'): [('Annie', 'sister', 'Heather'), ('Heather', 'grandmother', 'Shantel')]}, {('Annie', 'sister', 'Heather'): [('Annie', 'father', 'Pedro'), ('Pedro', 'daughter', 'Heather')]}, {('Pedro', 'daughter', 'Heather'): [('Pedro', 'daughter', 'Cheryl'), ('Cheryl', 'sister', 'Heather')]}]
['father', 'daughter', 'sister', 'grandmother']