[Dale] and his sister [Amy] stood in line at the fair. [Dale] is taking his son [Travis] out for coffee.
('Amy', 'Travis')
[Dale] and his sister [Amy] stood in line at the fair. [Dale] is taking his son [Travis] out for coffee.
[{('Amy', 'nephew', 'Travis'): [('Amy', 'brother', 'Dale'), ('Dale', 'son', 'Travis')]}]
['brother', 'son']