[Nancy] had lunch with her brother [Dale]. She told him about her son [Robert] getting a scholarship.
('Dale', 'Robert')
[Nancy] had lunch with her brother [Dale]. She told him about her son [Robert] getting a scholarship.
[{('Dale', 'nephew', 'Robert'): [('Dale', 'sister', 'Nancy'), ('Nancy', 'son', 'Robert')]}]
['sister', 'son']