[Glen]'s mother, [Amy], was eager to show his wife, [Natalia], her new car.
('Natalia', 'Amy')
[Glen]'s mother, [Amy], was eager to show his wife, [Natalia], her new car.
[{('Natalia', 'mother-in-law', 'Amy'): [('Natalia', 'husband', 'Glen'), ('Glen', 'mother', 'Amy')]}]
['husband', 'mother']