[Pedro] took his daughter [Heather] and son [Jeffrey] to the beach. [Harold] took his wife, [Shantel], to the circus. [Shantel] invited her granddaughter, [Heather], along.
('Harold', 'Jeffrey')
[Harold] took his wife, [Shantel], to the circus. [Shantel] invited her granddaughter, [Heather], along. [Pedro] took his daughter [Heather] and son [Jeffrey] to the beach.
[{('Harold', 'grandson', 'Jeffrey'): [('Harold', 'wife', 'Shantel'), ('Shantel', 'grandson', 'Jeffrey')]}, {('Shantel', 'grandson', 'Jeffrey'): [('Shantel', 'granddaughter', 'Heather'), ('Heather', 'brother', 'Jeffrey')]}, {('Heather', 'brother', 'Jeffrey'): [('Heather', 'father', 'Pedro'), ('Pedro', 'son', 'Jeffrey')]}]
['wife', 'granddaughter', 'father', 'son']