[Glen] and his mother, [Amy] and his wife, [Natalia] all have the same birthday.
('Natalia', 'Amy')
[Glen] and his mother, [Amy] and his wife, [Natalia] all have the same birthday.
[{('Natalia', 'mother-in-law', 'Amy'): [('Natalia', 'husband', 'Glen'), ('Glen', 'mother', 'Amy')]}]
['husband', 'mother']