[Nicholas]'s son, [Milton], was ill and needed to be picked up at school. [Nicholas] hurried to his side. [Milton] and his sister [Emily] love to play video games.
('Nicholas', 'Emily')
[Nicholas]'s son, [Milton], was ill and needed to be picked up at school. [Nicholas] hurried to his side. [Milton] and his sister [Emily] love to play video games.
[{('Nicholas', 'daughter', 'Emily'): [('Nicholas', 'son', 'Milton'), ('Milton', 'sister', 'Emily')]}]
['son', 'sister']