[James] and his sister [Cheryl] were getting ready for a picnic. [Cheryl]'s sister [Rebecca] is bringing a salad while [James]'s father [Pedro] is bring the wine. [Pedro] is proud of his son. His name is [Jeffrey].
('Jeffrey', 'Rebecca')
[Pedro] is proud of his son. His name is [Jeffrey]. [James] and his sister [Cheryl] were getting ready for a picnic. [Cheryl]'s sister [Rebecca] is bringing a salad while [James]'s father [Pedro] is bring the wine.
[{('Jeffrey', 'sister', 'Rebecca'): [('Jeffrey', 'brother', 'James'), ('James', 'sister', 'Rebecca')]}, {('James', 'sister', 'Rebecca'): [('James', 'sister', 'Cheryl'), ('Cheryl', 'sister', 'Rebecca')]}, {('Jeffrey', 'brother', 'James'): [('Jeffrey', 'father', 'Pedro'), ('Pedro', 'son', 'James')]}]
['father', 'son', 'sister', 'sister']