[Dale]'s son [James] had a recital, so [Dale] asked his sister [Amy] if she wanted to go.
('Amy', 'James')
[Dale]'s son [James] had a recital, so [Dale] asked his sister [Amy] if she wanted to go.
[{('Amy', 'nephew', 'James'): [('Amy', 'brother', 'Dale'), ('Dale', 'son', 'James')]}]
['brother', 'son']