[Nancy] took her daughter [Heidi] to the mall. [Jeff], [Heidi]'s husband, stayed in the car.
('Nancy', 'Jeff')
[Nancy] took her daughter [Heidi] to the mall. [Jeff], [Heidi]'s husband, stayed in the car.
[{('Nancy', 'son-in-law', 'Jeff'): [('Nancy', 'daughter', 'Heidi'), ('Heidi', 'husband', 'Jeff')]}]
['daughter', 'husband']