[Theresa] was trying to call her brother [Nicholas]. He was busy taking care of his son [Dennis], so he did n't hear the phone ringing.
('Theresa', 'Dennis')
[Theresa] was trying to call her brother [Nicholas]. He was busy taking care of his son [Dennis], so he did n't hear the phone ringing.
[{('Theresa', 'nephew', 'Dennis'): [('Theresa', 'brother', 'Nicholas'), ('Nicholas', 'son', 'Dennis')]}]
['brother', 'son']