[Jacob] bought a new refrigerator for his mother [Nancy]. [Jacob] and her sister [Linda] decided to take a trip to Mexico together.
('Linda', 'Nancy')
[Jacob] and her sister [Linda] decided to take a trip to Mexico together. [Jacob] bought a new refrigerator for his mother [Nancy].
[{('Linda', 'mother', 'Nancy'): [('Linda', 'brother', 'Jacob'), ('Jacob', 'mother', 'Nancy')]}]
['brother', 'mother']