[Amy] has a son called [Milton]. Each day they go to the park after school. [Milton] takes his wife [Mary] out for their anniversary.
('Amy', 'Mary')
[Amy] has a son called [Milton]. Each day they go to the park after school. [Milton] takes his wife [Mary] out for their anniversary.
[{('Amy', 'daughter-in-law', 'Mary'): [('Amy', 'son', 'Milton'), ('Milton', 'wife', 'Mary')]}]
['son', 'wife']