[George] and his son [John] went to visit Michael´s mother [Ashley] last weekend.
('John', 'Ashley')
[George] and his son [John] went to visit Michael´s mother [Ashley] last weekend.
[{('John', 'grandmother', 'Ashley'): [('John', 'father', 'George'), ('George', 'mother', 'Ashley')]}]
['father', 'mother']