[Nancy] made chicken noodle soup for her son [Jeff]. [Jeff]'s brother [Kevin] did n't want to have any.
('Kevin', 'Nancy')
[Nancy] made chicken noodle soup for her son [Jeff]. [Jeff]'s brother [Kevin] did n't want to have any.
[{('Kevin', 'mother', 'Nancy'): [('Kevin', 'brother', 'Jeff'), ('Jeff', 'mother', 'Nancy')]}]
['brother', 'mother']