[Natalia] borrowed some money from her brother [Dennis]. [Natalia] took her younger sister [Mary] to the carnival last weekend.
('Mary', 'Dennis')
[Natalia] took her younger sister [Mary] to the carnival last weekend. [Natalia] borrowed some money from her brother [Dennis].
[{('Mary', 'brother', 'Dennis'): [('Mary', 'sister', 'Natalia'), ('Natalia', 'brother', 'Dennis')]}]
['sister', 'brother']