[Joshua] watched his son [Joseph] play catch. [Joseph] tossed the ball back and fourth with his brother [Clarence]. [Clarence] and his sister [Felicia] went to the movies to watch the newest superhero flick.
('Joshua', 'Felicia')
[Joshua] watched his son [Joseph] play catch. [Joseph] tossed the ball back and fourth with his brother [Clarence]. [Clarence] and his sister [Felicia] went to the movies to watch the newest superhero flick.
[{('Joshua', 'daughter', 'Felicia'): [('Joshua', 'son', 'Clarence'), ('Clarence', 'sister', 'Felicia')]}, {('Joshua', 'son', 'Clarence'): [('Joshua', 'son', 'Joseph'), ('Joseph', 'brother', 'Clarence')]}]
['son', 'brother', 'sister']