[Jeff]'s brother, [Kevin], is important to him. [Jeff]'s mom, [Nancy], cares for both of them.
('Nancy', 'Kevin')
[Jeff]'s brother, [Kevin], is important to him. [Jeff]'s mom, [Nancy], cares for both of them.
[{('Nancy', 'son', 'Kevin'): [('Nancy', 'son', 'Jeff'), ('Jeff', 'brother', 'Kevin')]}]
['son', 'brother']