[Nancy] took her son [Jeff], and [Jeff]'s wife [Heidi], out to dinner at a fancy French place that opened up near their home.
('Heidi', 'Nancy')
[Nancy] took her son [Jeff], and [Jeff]'s wife [Heidi], out to dinner at a fancy French place that opened up near their home.
[{('Heidi', 'mother-in-law', 'Nancy'): [('Heidi', 'husband', 'Jeff'), ('Jeff', 'mother', 'Nancy')]}]
['husband', 'mother']