[Dorothy] and her daughter [Cheryl] went out to dinner. [Pedro] made a sandwich for his son [Jeffrey]. [Jeffrey]'s brother [Jerome] ate an apple instead. [Jerome] asked his mother [Dorothy] to read to him. [Dorothy] was too busy.
('Pedro', 'Cheryl')
[Pedro] made a sandwich for his son [Jeffrey]. [Jeffrey]'s brother [Jerome] ate an apple instead. [Jerome] asked his mother [Dorothy] to read to him. [Dorothy] was too busy. [Dorothy] and her daughter [Cheryl] went out to dinner.
[{('Pedro', 'daughter', 'Cheryl'): [('Pedro', 'son', 'Jeffrey'), ('Jeffrey', 'sister', 'Cheryl')]}, {('Jeffrey', 'sister', 'Cheryl'): [('Jeffrey', 'brother', 'Jerome'), ('Jerome', 'sister', 'Cheryl')]}, {('Jerome', 'sister', 'Cheryl'): [('Jerome', 'mother', 'Dorothy'), ('Dorothy', 'daughter', 'Cheryl')]}]
['son', 'brother', 'mother', 'daughter']