[Natalia] was playing in the sandbox with her brother [Michael]. [Michael] is happy that his brother, [Dennis], is becoming successful.
('Natalia', 'Dennis')
[Natalia] was playing in the sandbox with her brother [Michael]. [Michael] is happy that his brother, [Dennis], is becoming successful.
[{('Natalia', 'brother', 'Dennis'): [('Natalia', 'brother', 'Michael'), ('Michael', 'brother', 'Dennis')]}]
['brother', 'brother']