[Nancy] visited her son [Jeff] at college. [George] invited his nephew, [Jeff] to the baseball game.
('Nancy', 'George')
[Nancy] visited her son [Jeff] at college. [George] invited his nephew, [Jeff] to the baseball game.
[{('Nancy', 'brother', 'George'): [('Nancy', 'son', 'Jeff'), ('Jeff', 'uncle', 'George')]}]
['son', 'uncle']