[Dale] lit the campfire with his sister [Nancy] while his son [Travis] gathered wood.
('Travis', 'Nancy')
[Dale] lit the campfire with his sister [Nancy] while his son [Travis] gathered wood.
[{('Travis', 'aunt', 'Nancy'): [('Travis', 'father', 'Dale'), ('Dale', 'sister', 'Nancy')]}]
['father', 'sister']