[Joshua]'s sister, [Cindy], bought movie tickets at a discount rate. [David] needed to go to the store. [David] asked her sister [Cindy] for a ride. [David]'s brother [Wesley] was going to be the star in the new show.
('Joshua', 'Wesley')
[Joshua]'s sister, [Cindy], bought movie tickets at a discount rate. [David] needed to go to the store. [David] asked her sister [Cindy] for a ride. [David]'s brother [Wesley] was going to be the star in the new show.
[{('Joshua', 'brother', 'Wesley'): [('Joshua', 'sister', 'Cindy'), ('Cindy', 'brother', 'Wesley')]}, {('Cindy', 'brother', 'Wesley'): [('Cindy', 'sister', 'David'), ('David', 'brother', 'Wesley')]}]
['sister', 'sister', 'brother']