[Jeff]'s wife, [Heidi], never gets along with his mother [Nancy] when they go on a picnic.
('Heidi', 'Nancy')
[Jeff]'s wife, [Heidi], never gets along with his mother [Nancy] when they go on a picnic.
[{('Heidi', 'mother-in-law', 'Nancy'): [('Heidi', 'husband', 'Jeff'), ('Jeff', 'mother', 'Nancy')]}]
['husband', 'mother']