[Jeff] and [Heidi] are married. [Heidi] went shopping at the mall with her mother [Nancy]
('Jeff', 'Nancy')
[Jeff] and [Heidi] are married. [Heidi] went shopping at the mall with her mother [Nancy]
[{('Jeff', 'mother-in-law', 'Nancy'): [('Jeff', 'wife', 'Heidi'), ('Heidi', 'mother', 'Nancy')]}]
['wife', 'mother']