[George] and his sister [Amy] were fighting. [Glen], [Amy]'s son, got them to put aside their differences and make up.
('George', 'Glen')
[George] and his sister [Amy] were fighting. [Glen], [Amy]'s son, got them to put aside their differences and make up.
[{('George', 'nephew', 'Glen'): [('George', 'sister', 'Amy'), ('Amy', 'son', 'Glen')]}]
['sister', 'son']