[Jeff] and his wife [Heidi] meet [Heidi]'s father [Wayne] for dinner at the nice restaurant.
('Jeff', 'Wayne')
[Jeff] and his wife [Heidi] meet [Heidi]'s father [Wayne] for dinner at the nice restaurant.
[{('Jeff', 'father-in-law', 'Wayne'): [('Jeff', 'wife', 'Heidi'), ('Heidi', 'father', 'Wayne')]}]
['wife', 'father']