[Nancy] went on a fishing trip with her youngest child, [Kevin], and her brother [George].
('George', 'Kevin')
[Nancy] went on a fishing trip with her youngest child, [Kevin], and her brother [George].
[{('George', 'nephew', 'Kevin'): [('George', 'sister', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['sister', 'son']