[Nicholas] was making tacos with his son [Michael]. [Michael]'s sister [Natalia] was mixing drinks.
('Natalia', 'Nicholas')
[Nicholas] was making tacos with his son [Michael]. [Michael]'s sister [Natalia] was mixing drinks.
[{('Natalia', 'father', 'Nicholas'): [('Natalia', 'brother', 'Michael'), ('Michael', 'father', 'Nicholas')]}]
['brother', 'father']