[Theodore] likes playing catch with his sister [Tina], but his brother [Chris] never wants to play. [Irvin]'s sister, [Tina], bought movie tickets at a discount rate.
('Irvin', 'Chris')
[Irvin]'s sister, [Tina], bought movie tickets at a discount rate. [Theodore] likes playing catch with his sister [Tina], but his brother [Chris] never wants to play.
[{('Irvin', 'brother', 'Chris'): [('Irvin', 'brother', 'Theodore'), ('Theodore', 'brother', 'Chris')]}, {('Irvin', 'brother', 'Theodore'): [('Irvin', 'sister', 'Tina'), ('Tina', 'brother', 'Theodore')]}]
['sister', 'brother', 'brother']