[Jerry] asked his wife, [Janet], to save money for a vacation. [Janet]'s father, [George], chipped in some money.
('Jerry', 'George')
[Jerry] asked his wife, [Janet], to save money for a vacation. [Janet]'s father, [George], chipped in some money.
[{('Jerry', 'father-in-law', 'George'): [('Jerry', 'wife', 'Janet'), ('Janet', 'father', 'George')]}]
['wife', 'father']