[Pedro] told his daughter, [Cheryl], to clean her room. [Cheryl] complained to her sister, [Heather], about having to clean her room. [Harold]'s son, [Robert], went to the candy store. [Robert]'s brother, [Pedro], went with him.
('Harold', 'Heather')
[Harold]'s son, [Robert], went to the candy store. [Robert]'s brother, [Pedro], went with him. [Pedro] told his daughter, [Cheryl], to clean her room. [Cheryl] complained to her sister, [Heather], about having to clean her room.
[{('Harold', 'granddaughter', 'Heather'): [('Harold', 'son', 'Pedro'), ('Pedro', 'daughter', 'Heather')]}, {('Harold', 'son', 'Pedro'): [('Harold', 'son', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Pedro', 'daughter', 'Heather'): [('Pedro', 'daughter', 'Cheryl'), ('Cheryl', 'sister', 'Heather')]}]
['son', 'brother', 'daughter', 'sister']