[Natalia] was trying to get the attention of her father [Nicholas]. [Nicholas] did n't hear her because he was so busy playing baseball with his son [Dennis].
('Natalia', 'Dennis')
[Natalia] was trying to get the attention of her father [Nicholas]. [Nicholas] did n't hear her because he was so busy playing baseball with his son [Dennis].
[{('Natalia', 'brother', 'Dennis'): [('Natalia', 'father', 'Nicholas'), ('Nicholas', 'son', 'Dennis')]}]
['father', 'son']