[Heather] told her dad [Pedro] about how much fun she had with her sister [Cheryl] at the park. [Antonio] and his brother [Robert] went to the arcade. They had a wonderful time. [Pedro] hit his brother [Antonio] in the head.
('Robert', 'Cheryl')
[Antonio] and his brother [Robert] went to the arcade. They had a wonderful time. [Pedro] hit his brother [Antonio] in the head. [Heather] told her dad [Pedro] about how much fun she had with her sister [Cheryl] at the park.
[{('Robert', 'niece', 'Cheryl'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'daughter', 'Cheryl')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'brother', 'Antonio'), ('Antonio', 'brother', 'Pedro')]}, {('Pedro', 'daughter', 'Cheryl'): [('Pedro', 'daughter', 'Heather'), ('Heather', 'sister', 'Cheryl')]}]
['brother', 'brother', 'daughter', 'sister']