[George] often goes out for lunch with his sister, [Amy]. [Ann] took her father [George] out for his birthday. They had a wonderful time.
('Ann', 'Amy')
[Ann] took her father [George] out for his birthday. They had a wonderful time. [George] often goes out for lunch with his sister, [Amy].
[{('Ann', 'aunt', 'Amy'): [('Ann', 'father', 'George'), ('George', 'sister', 'Amy')]}]
['father', 'sister']