[Jerry] and [Janet] decide to visit his mom [Lillian] for lunch.
('Janet', 'Lillian')
[Jerry] and [Janet] decide to visit his mom [Lillian] for lunch.
[{('Janet', 'mother-in-law', 'Lillian'): [('Janet', 'husband', 'Jerry'), ('Jerry', 'mother', 'Lillian')]}]
['husband', 'mother']