[Jeff] woke up and said hello to his wife, [Heidi]. [Heidi] took her mother, [Nancy], out for lunch.
('Jeff', 'Nancy')
[Jeff] woke up and said hello to his wife, [Heidi]. [Heidi] took her mother, [Nancy], out for lunch.
[{('Jeff', 'mother-in-law', 'Nancy'): [('Jeff', 'wife', 'Heidi'), ('Heidi', 'mother', 'Nancy')]}]
['wife', 'mother']