[Nancy] and her daughter [Heidi] were on vaction. [Jeff] ate dinner with his wife [Heidi].
('Jeff', 'Nancy')
[Jeff] ate dinner with his wife [Heidi]. [Nancy] and her daughter [Heidi] were on vaction.
[{('Jeff', 'mother-in-law', 'Nancy'): [('Jeff', 'wife', 'Heidi'), ('Heidi', 'mother', 'Nancy')]}]
['wife', 'mother']