[Robert] asked his mother [Nancy] to read to him. [Nancy] was too busy. [George] and his sister [Nancy] went to brunch today at the new diner.
('Robert', 'George')
[Robert] asked his mother [Nancy] to read to him. [Nancy] was too busy. [George] and his sister [Nancy] went to brunch today at the new diner.
[{('Robert', 'uncle', 'George'): [('Robert', 'mother', 'Nancy'), ('Nancy', 'brother', 'George')]}]
['mother', 'brother']