[Jerry] bought a new refrigerator for his mother [Lillian]. [Janet] and her husband [Jerry] just got back from their honeymoon in Hawaii. They had a wonderful time there.
('Janet', 'Lillian')
[Janet] and her husband [Jerry] just got back from their honeymoon in Hawaii. They had a wonderful time there. [Jerry] bought a new refrigerator for his mother [Lillian].
[{('Janet', 'mother-in-law', 'Lillian'): [('Janet', 'husband', 'Jerry'), ('Jerry', 'mother', 'Lillian')]}]
['husband', 'mother']